21231850 has 24 divisors (see below), whose sum is σ = 40458348. Its totient is φ = 8284800.

The previous prime is 21231841. The next prime is 21231851. The reversal of 21231850 is 5813212.

It can be written as a sum of positive squares in 6 ways, for example, as 2647129 + 18584721 = 1627^2 + 4311^2 .

It is not an unprimeable number, because it can be changed into a prime (21231851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3129 + ... + 7228.

Almost surely, 2^21231850 is an apocalyptic number.

21231850 is a deficient number, since it is larger than the sum of its proper divisors (19226498).

21231850 is a wasteful number, since it uses less digits than its factorization.

21231850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10410 (or 10405 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 21231850 is about 4607.8031641987. The cubic root of 21231850 is about 276.9040317109.

The spelling of 21231850 in words is "twenty-one million, two hundred thirty-one thousand, eight hundred fifty".