21329056 has 24 divisors (see below), whose sum is σ = 47990880. Its totient is φ = 9140928.

The previous prime is 21329051. The next prime is 21329069. The reversal of 21329056 is 65092312.

It is a super-2 number, since 2×21329056² = 909857259702272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (21329051) 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, 47386 + ... + 47833.

It is an arithmetic number, because the mean of its divisors is an integer number (1999620).

Almost surely, 2^21329056 is an apocalyptic number.

It is an amenable number.

21329056 is an abundant number, since it is smaller than the sum of its proper divisors (26661824).

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

21329056 is an equidigital number, since it uses as much as digits as its factorization.

21329056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95236 (or 95228 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 21329056 is about 4618.3390953892. The cubic root of 21329056 is about 277.3259726432.

The spelling of 21329056 in words is "twenty-one million, three hundred twenty-nine thousand, fifty-six".