22131256 has 16 divisors (see below), whose sum is σ = 47424240. Its totient is φ = 9484800.

The previous prime is 22131223. The next prime is 22131259. The reversal of 22131256 is 65213122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22131259) 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, 197545 + ... + 197656.

It is an arithmetic number, because the mean of its divisors is an integer number (2964015).

Almost surely, 2^22131256 is an apocalyptic number.

It is an amenable number.

22131256 is an abundant number, since it is smaller than the sum of its proper divisors (25292984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22131256 is a wasteful number, since it uses less digits than its factorization.

22131256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395214 (or 395210 counting only the distinct ones).

The product of its digits is 720, while the sum is 22.

The square root of 22131256 is about 4704.3868888517. The cubic root of 22131256 is about 280.7600777112.

Adding to 22131256 its reverse (65213122), we get a palindrome (87344378).

The spelling of 22131256 in words is "twenty-two million, one hundred thirty-one thousand, two hundred fifty-six".