22157231 has 4 divisors (see below), whose sum is σ = 22239264. Its totient is φ = 22075200.

The previous prime is 22157207. The next prime is 22157263. The reversal of 22157231 is 13275122.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 22157231 - 2⁶ = 22157167 is a prime.

It is a super-2 number, since 2×22157231² = 981885771174722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22157197 and 22157206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22156231) 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, 40610 + ... + 41151.

It is an arithmetic number, because the mean of its divisors is an integer number (5559816).

Almost surely, 2^22157231 is an apocalyptic number.

22157231 is a deficient number, since it is larger than the sum of its proper divisors (82033).

22157231 is an equidigital number, since it uses as much as digits as its factorization.

22157231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82032.

The product of its digits is 840, while the sum is 23.

The square root of 22157231 is about 4707.1468003452. The cubic root of 22157231 is about 280.8698755428.

The spelling of 22157231 in words is "twenty-two million, one hundred fifty-seven thousand, two hundred thirty-one".