21373012 has 24 divisors (see below), whose sum is σ = 40884480. Its totient is φ = 9732480.

The previous prime is 21372991. The next prime is 21373061. The reversal of 21373012 is 21037312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2962 + ... + 7177.

It is an arithmetic number, because the mean of its divisors is an integer number (1703520).

Almost surely, 2^21373012 is an apocalyptic number.

It is an amenable number.

21373012 is a deficient number, since it is larger than the sum of its proper divisors (19511468).

21373012 is a wasteful number, since it uses less digits than its factorization.

21373012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10191 (or 10189 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 21373012 is about 4623.0954997707. The cubic root of 21373012 is about 277.5163510642.

The spelling of 21373012 in words is "twenty-one million, three hundred seventy-three thousand, twelve".