21508092 has 30 divisors (see below), whose sum is σ = 56227248. Its totient is φ = 7169256.

The previous prime is 21508087. The next prime is 21508099. The reversal of 21508092 is 29080512.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21508099) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 32868 + ... + 33515.

Almost surely, 2^21508092 is an apocalyptic number.

It is an amenable number.

21508092 is an abundant number, since it is smaller than the sum of its proper divisors (34719156).

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

21508092 is a wasteful number, since it uses less digits than its factorization.

21508092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66399 (or 66388 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 21508092 is about 4637.6817484601. The cubic root of 21508092 is about 278.0997692384.

The spelling of 21508092 in words is "twenty-one million, five hundred eight thousand, ninety-two".