22131756 has 108 divisors (see below), whose sum is σ = 62774712. Its totient is φ = 6547968.

The previous prime is 22131749. The next prime is 22131761. The reversal of 22131756 is 65713122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 514671 + ... + 514713.

Almost surely, 2^22131756 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22131756, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31387356).

22131756 is an abundant number, since it is smaller than the sum of its proper divisors (40642956).

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

22131756 is a wasteful number, since it uses less digits than its factorization.

22131756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 94 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 22131756 is about 4704.4400304393. The cubic root of 22131756 is about 280.7621920509.

Adding to 22131756 its reverse (65713122), we get a palindrome (87844878).

It can be divided in two parts, 2213 and 1756, that added together give a square (3969 = 63²).

The spelling of 22131756 in words is "twenty-two million, one hundred thirty-one thousand, seven hundred fifty-six".