21038712 has 32 divisors (see below), whose sum is σ = 52846080. Its totient is φ = 6979680.

The previous prime is 21038687. The next prime is 21038713. The reversal of 21038712 is 21783012.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21038713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3387 + ... + 7317.

It is an arithmetic number, because the mean of its divisors is an integer number (1651440).

Almost surely, 2^21038712 is an apocalyptic number.

It is an amenable number.

21038712 is an abundant number, since it is smaller than the sum of its proper divisors (31807368).

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

21038712 is a wasteful number, since it uses less digits than its factorization.

21038712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4163 (or 4159 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 21038712 is about 4586.7975756512. The cubic root of 21038712 is about 276.0618428947.

The spelling of 21038712 in words is "twenty-one million, thirty-eight thousand, seven hundred twelve".