21186992 has 10 divisors (see below), whose sum is σ = 41049828. Its totient is φ = 10593488.

The previous prime is 21186983. The next prime is 21187013. The reversal of 21186992 is 29968112.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 662078 + ... + 662109.

Almost surely, 2^21186992 is an apocalyptic number.

It is an amenable number.

21186992 is a deficient number, since it is larger than the sum of its proper divisors (19862836).

21186992 is a wasteful number, since it uses less digits than its factorization.

21186992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324195 (or 1324189 counting only the distinct ones).

The product of its digits is 15552, while the sum is 38.

The square root of 21186992 is about 4602.9329780044. The cubic root of 21186992 is about 276.7088827695.

The spelling of 21186992 in words is "twenty-one million, one hundred eighty-six thousand, nine hundred ninety-two".