21700902 has 16 divisors (see below), whose sum is σ = 43479360. Its totient is φ = 7220712.

The previous prime is 21700901. The next prime is 21700949. The reversal of 21700902 is 20900712.

It is a happy number.

It is a super-2 number, since 2×21700902² = 941858295227208, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21700901) 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, 793 + ... + 6635.

It is an arithmetic number, because the mean of its divisors is an integer number (2717460).

Almost surely, 2^21700902 is an apocalyptic number.

21700902 is an abundant number, since it is smaller than the sum of its proper divisors (21778458).

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

21700902 is a wasteful number, since it uses less digits than its factorization.

21700902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6467.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 21700902 is about 4658.4226944321. The cubic root of 21700902 is about 278.9283098394.

The spelling of 21700902 in words is "twenty-one million, seven hundred thousand, nine hundred two".