21620712 has 16 divisors (see below), whose sum is σ = 54051840. Its totient is φ = 7206896.

The previous prime is 21620693. The next prime is 21620723. The reversal of 21620712 is 21702612.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 450408 + ... + 450455.

It is an arithmetic number, because the mean of its divisors is an integer number (3378240).

Almost surely, 2^21620712 is an apocalyptic number.

It is an amenable number.

21620712 is an abundant number, since it is smaller than the sum of its proper divisors (32431128).

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

21620712 is a wasteful number, since it uses less digits than its factorization.

21620712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900872 (or 900868 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 21620712 is about 4649.8077379608. The cubic root of 21620712 is about 278.5843169392.

The spelling of 21620712 in words is "twenty-one million, six hundred twenty thousand, seven hundred twelve".