21332870 has 32 divisors (see below), whose sum is σ = 41640480. Its totient is φ = 7868640.

The previous prime is 21332837. The next prime is 21332879. The reversal of 21332870 is 7823312.

It is a super-3 number, since 3×21332870³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21332879) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21485 + ... + 22455.

It is an arithmetic number, because the mean of its divisors is an integer number (1301265).

Almost surely, 2^21332870 is an apocalyptic number.

21332870 is a deficient number, since it is larger than the sum of its proper divisors (20307610).

21332870 is an equidigital number, since it uses as much as digits as its factorization.

21332870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017 (or 991 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 21332870 is about 4618.7519959400. The cubic root of 21332870 is about 277.3425018670.

The spelling of 21332870 in words is "twenty-one million, three hundred thirty-two thousand, eight hundred seventy".