22369621 has 4 divisors (see below), whose sum is σ = 22380544. Its totient is φ = 22358700.

The previous prime is 22369601. The next prime is 22369661. The reversal of 22369621 is 12696322.

22369621 is nontrivially palindromic in base 2 and base 4.

22369621 is an esthetic number in base 2, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a 3-Lehmer number, since φ(22369621) divides (22369621-1)³.

It is a cyclic number.

It is not a de Polignac number, because 22369621 - 2²³ = 13981013 is a prime.

It is the 26-th Jacobsthal number.

It is a deceptive number, since it divides R_22369620.

It is a Duffinian number.

22369621 is an undulating number in base 2.

22369621 is a nontrivial repdigit in base 4.

It is a plaindrome in base 4 and base 16.

It is a nialpdrome in base 4.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22369601) by changing a digit.

It is a nontrivial repunit in base 4.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1365 + ... + 6826.

It is an arithmetic number, because the mean of its divisors is an integer number (5595136).

It is a Poulet number, since it divides 2^22369620-1.

Almost surely, 2^22369621 is an apocalyptic number.

22369621 is the 2731-st octagonal number.

It is an amenable number.

22369621 is a deficient number, since it is larger than the sum of its proper divisors (10923).

22369621 is an equidigital number, since it uses as much as digits as its factorization.

22369621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10922.

The product of its digits is 7776, while the sum is 31.

The square root of 22369621 is about 4729.6533699628. The cubic root of 22369621 is about 281.7644571728.

The spelling of 22369621 in words is "twenty-two million, three hundred sixty-nine thousand, six hundred twenty-one".