22211661 has 4 divisors (see below), whose sum is σ = 29615552. Its totient is φ = 14807772.

The previous prime is 22211653. The next prime is 22211663. The reversal of 22211661 is 16611222.

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.

It is not a de Polignac number, because 22211661 - 2³ = 22211653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22211663) by changing a digit.

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, 3701941 + ... + 3701946.

It is an arithmetic number, because the mean of its divisors is an integer number (7403888).

Almost surely, 2^22211661 is an apocalyptic number.

It is an amenable number.

22211661 is a deficient number, since it is larger than the sum of its proper divisors (7403891).

22211661 is an equidigital number, since it uses as much as digits as its factorization.

22211661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7403890.

The product of its digits is 288, while the sum is 21.

The square root of 22211661 is about 4712.9248880074. The cubic root of 22211661 is about 281.0996763106.

Adding to 22211661 its reverse (16611222), we get a palindrome (38822883).

The spelling of 22211661 in words is "twenty-two million, two hundred eleven thousand, six hundred sixty-one".