21333690 has 48 divisors (see below), whose sum is σ = 63393408. Its totient is φ = 4876128.

The previous prime is 21333679. The next prime is 21333701. The reversal of 21333690 is 9633312.

It is an interprime number because it is at equal distance from previous prime (21333679) and next prime (21333701).

It is a super-2 number, since 2×21333690² = 910252658032200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16302 + ... + 17561.

It is an arithmetic number, because the mean of its divisors is an integer number (1320696).

Almost surely, 2^21333690 is an apocalyptic number.

21333690 is an abundant number, since it is smaller than the sum of its proper divisors (42059718).

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

21333690 is a wasteful number, since it uses less digits than its factorization.

21333690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33883 (or 33880 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 27.

The square root of 21333690 is about 4618.8407636549. The cubic root of 21333690 is about 277.3460553495.

The spelling of 21333690 in words is "twenty-one million, three hundred thirty-three thousand, six hundred ninety".