21956202 has 12 divisors (see below), whose sum is σ = 47571810. Its totient is φ = 7318728.

The previous prime is 21956159. The next prime is 21956227. The reversal of 21956202 is 20265912.

It can be written as a sum of positive squares in only one way, i.e., 19263321 + 2692881 = 4389^2 + 1641^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 609877 + ... + 609912.

Almost surely, 2^21956202 is an apocalyptic number.

21956202 is an abundant number, since it is smaller than the sum of its proper divisors (25615608).

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

21956202 is a wasteful number, since it uses less digits than its factorization.

21956202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1219797 (or 1219794 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 21956202 is about 4685.7445512960. The cubic root of 21956202 is about 280.0178645064.

The spelling of 21956202 in words is "twenty-one million, nine hundred fifty-six thousand, two hundred two".