21986692 has 36 divisors (see below), whose sum is σ = 48207180. Its totient is φ = 8697024.

The previous prime is 21986687. The next prime is 21986693. The reversal of 21986692 is 29668912.

It can be written as a sum of positive squares in 2 ways, for example, as 9834496 + 12152196 = 3136^2 + 3486^2 .

It is not an unprimeable number, because it can be changed into a prime (21986693) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1767 + ... + 6862.

Almost surely, 2^21986692 is an apocalyptic number.

It is an amenable number.

21986692 is an abundant number, since it is smaller than the sum of its proper divisors (26220488).

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

21986692 is a wasteful number, since it uses less digits than its factorization.

21986692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8660 (or 8651 counting only the distinct ones).

The product of its digits is 93312, while the sum is 43.

The square root of 21986692 is about 4688.9969076552. The cubic root of 21986692 is about 280.1474223673.

The spelling of 21986692 in words is "twenty-one million, nine hundred eighty-six thousand, six hundred ninety-two".