21056032 has 12 divisors (see below), whose sum is σ = 41454126. Its totient is φ = 10528000.

The previous prime is 21056029. The next prime is 21056033. The reversal of 21056032 is 23065012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 14107536 + 6948496 = 3756^2 + 2636^2 .

It is not an unprimeable number, because it can be changed into a prime (21056033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328969 + ... + 329032.

Almost surely, 2^21056032 is an apocalyptic number.

It is an amenable number.

21056032 is a deficient number, since it is larger than the sum of its proper divisors (20398094).

21056032 is an equidigital number, since it uses as much as digits as its factorization.

21056032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658011 (or 658003 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 21056032 is about 4588.6852147429. The cubic root of 21056032 is about 276.1375775632.

The spelling of 21056032 in words is "twenty-one million, fifty-six thousand, thirty-two".