21038212 has 36 divisors (see below), whose sum is σ = 41066508. Its totient is φ = 9374400.

The previous prime is 21038209. The next prime is 21038219. The reversal of 21038212 is 21283012.

It can be written as a sum of positive squares in 2 ways, for example, as 1110916 + 19927296 = 1054^2 + 4464^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21038212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21038219) 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, 49762 + ... + 50182.

Almost surely, 2^21038212 is an apocalyptic number.

It is an amenable number.

21038212 is a deficient number, since it is larger than the sum of its proper divisors (20028296).

21038212 is a wasteful number, since it uses less digits than its factorization.

21038212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500 (or 467 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 21038212 is about 4586.7430710691. The cubic root of 21038212 is about 276.0596559418.

The spelling of 21038212 in words is "twenty-one million, thirty-eight thousand, two hundred twelve".