21331850 has 12 divisors (see below), whose sum is σ = 39677334. Its totient is φ = 8532720.

The previous prime is 21331847. The next prime is 21331867. The reversal of 21331850 is 5813312.

It can be written as a sum of positive squares in 3 ways, for example, as 11703241 + 9628609 = 3421^2 + 3103^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 213269 + ... + 213368.

Almost surely, 2^21331850 is an apocalyptic number.

21331850 is a deficient number, since it is larger than the sum of its proper divisors (18345484).

21331850 is a wasteful number, since it uses less digits than its factorization.

21331850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426649 (or 426644 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 21331850 is about 4618.6415751820. The cubic root of 21331850 is about 277.3380815545.

The spelling of 21331850 in words is "twenty-one million, three hundred thirty-one thousand, eight hundred fifty".