21201708 has 24 divisors (see below), whose sum is σ = 53968320. Its totient is φ = 6424720.

The previous prime is 21201707. The next prime is 21201721. The reversal of 21201708 is 80710212.

It is not an unprimeable number, because it can be changed into a prime (21201707) 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, 80178 + ... + 80441.

It is an arithmetic number, because the mean of its divisors is an integer number (2248680).

Almost surely, 2^21201708 is an apocalyptic number.

It is an amenable number.

21201708 is an abundant number, since it is smaller than the sum of its proper divisors (32766612).

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

21201708 is a wasteful number, since it uses less digits than its factorization.

21201708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160637 (or 160635 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 21201708 is about 4604.5312465006. The cubic root of 21201708 is about 276.7729331626.

It can be divided in two parts, 2120 and 1708, that added together give a triangular number (3828 = T₈₇).

The spelling of 21201708 in words is "twenty-one million, two hundred one thousand, seven hundred eight".