22621021 has 4 divisors (see below), whose sum is σ = 22930972. Its totient is φ = 22311072.

The previous prime is 22621007. The next prime is 22621037. The reversal of 22621021 is 12012622.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9696996 + 12924025 = 3114^2 + 3595^2 .

It is a cyclic number.

It is not a de Polignac number, because 22621021 - 2⁹ = 22620509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22620986 and 22621004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22621051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154866 + ... + 155011.

It is an arithmetic number, because the mean of its divisors is an integer number (5732743).

Almost surely, 2^22621021 is an apocalyptic number.

It is an amenable number.

22621021 is a deficient number, since it is larger than the sum of its proper divisors (309951).

22621021 is an equidigital number, since it uses as much as digits as its factorization.

22621021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309950.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 22621021 is about 4756.1561160248. The cubic root of 22621021 is about 282.8160599717.

Adding to 22621021 its reverse (12012622), we get a palindrome (34633643).

The spelling of 22621021 in words is "twenty-two million, six hundred twenty-one thousand, twenty-one".