21576132 has 30 divisors (see below), whose sum is σ = 56405118. Its totient is φ = 7191936.

The previous prime is 21576101. The next prime is 21576133. The reversal of 21576132 is 23167512.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17438976 + 4137156 = 4176^2 + 2034^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21576096 and 21576105.

It is not an unprimeable number, because it can be changed into a prime (21576133) 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 9 ways as a sum of consecutive naturals, for example, 32973 + ... + 33620.

Almost surely, 2^21576132 is an apocalyptic number.

It is an amenable number.

21576132 is an abundant number, since it is smaller than the sum of its proper divisors (34828986).

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

21576132 is a wasteful number, since it uses less digits than its factorization.

21576132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66609 (or 66598 counting only the distinct ones).

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

The square root of 21576132 is about 4645.0115177468. The cubic root of 21576132 is about 278.3927130970.

The spelling of 21576132 in words is "twenty-one million, five hundred seventy-six thousand, one hundred thirty-two".