21038996 has 36 divisors (see below), whose sum is σ = 42866964. Its totient is φ = 8997120.

The previous prime is 21038971. The next prime is 21038999. The reversal of 21038996 is 69983012.

It can be written as a sum of positive squares in 2 ways, for example, as 12859396 + 8179600 = 3586^2 + 2860^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21038999) 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, 6950 + ... + 9506.

It is an arithmetic number, because the mean of its divisors is an integer number (1190749).

Almost surely, 2^21038996 is an apocalyptic number.

It is an amenable number.

21038996 is an abundant number, since it is smaller than the sum of its proper divisors (21827968).

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

21038996 is a wasteful number, since it uses less digits than its factorization.

21038996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2600 (or 2587 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 21038996 is about 4586.8285339655. The cubic root of 21038996 is about 276.0630850685.

Subtracting 21038996 from its reverse (69983012), we obtain a square (48944016 = 6996²).

The spelling of 21038996 in words is "twenty-one million, thirty-eight thousand, nine hundred ninety-six".