21132956 has 12 divisors (see below), whose sum is σ = 39827592. Its totient is φ = 9753648.

The previous prime is 21132953. The next prime is 21132983. The reversal of 21132956 is 65923112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132953) 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, 203150 + ... + 203253.

It is an arithmetic number, because the mean of its divisors is an integer number (3318966).

Almost surely, 2^21132956 is an apocalyptic number.

21132956 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21132956 is a deficient number, since it is larger than the sum of its proper divisors (18694636).

21132956 is a wasteful number, since it uses less digits than its factorization.

21132956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406420 (or 406418 counting only the distinct ones).

The product of its digits is 3240, while the sum is 29.

The square root of 21132956 is about 4597.0594949380. The cubic root of 21132956 is about 276.4734400224.

The spelling of 21132956 in words is "twenty-one million, one hundred thirty-two thousand, nine hundred fifty-six".