22156643 has 4 divisors (see below), whose sum is σ = 22385160. Its totient is φ = 21928128.

The previous prime is 22156637. The next prime is 22156649. The reversal of 22156643 is 34665122.

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

It is an interprime number because it is at equal distance from previous prime (22156637) and next prime (22156649).

It is a cyclic number.

It is not a de Polignac number, because 22156643 - 2⁶ = 22156579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22156649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114113 + ... + 114306.

It is an arithmetic number, because the mean of its divisors is an integer number (5596290).

Almost surely, 2^22156643 is an apocalyptic number.

22156643 is a deficient number, since it is larger than the sum of its proper divisors (228517).

22156643 is an equidigital number, since it uses as much as digits as its factorization.

22156643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228516.

The product of its digits is 8640, while the sum is 29.

The square root of 22156643 is about 4707.0843417130. The cubic root of 22156643 is about 280.8673909823.

The spelling of 22156643 in words is "twenty-two million, one hundred fifty-six thousand, six hundred forty-three".