22131257 has 4 divisors (see below), whose sum is σ = 23296080. Its totient is φ = 20966436.

The previous prime is 22131223. The next prime is 22131259. The reversal of 22131257 is 75213122.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 22131257 - 2⁸ = 22131001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22131259) 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, 582383 + ... + 582420.

It is an arithmetic number, because the mean of its divisors is an integer number (5824020).

Almost surely, 2^22131257 is an apocalyptic number.

It is an amenable number.

22131257 is a deficient number, since it is larger than the sum of its proper divisors (1164823).

22131257 is a wasteful number, since it uses less digits than its factorization.

22131257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164822.

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

The square root of 22131257 is about 4704.3869951355. The cubic root of 22131257 is about 280.7600819399.

Adding to 22131257 its reverse (75213122), we get a palindrome (97344379).

The spelling of 22131257 in words is "twenty-two million, one hundred thirty-one thousand, two hundred fifty-seven".