21933790 has 32 divisors (see below), whose sum is σ = 42203520. Its totient is φ = 8182944.

The previous prime is 21933787. The next prime is 21933839. The reversal of 21933790 is 9733912.

It is a super-2 number, since 2×21933790² = 962182287528200, 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 15 ways as a sum of consecutive naturals, for example, 11869 + ... + 13591.

It is an arithmetic number, because the mean of its divisors is an integer number (1318860).

Almost surely, 2^21933790 is an apocalyptic number.

21933790 is a deficient number, since it is larger than the sum of its proper divisors (20269730).

21933790 is a wasteful number, since it uses less digits than its factorization.

21933790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1816.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 21933790 is about 4683.3524317523. The cubic root of 21933790 is about 279.9225551122.

The spelling of 21933790 in words is "twenty-one million, nine hundred thirty-three thousand, seven hundred ninety".