21188092 has 12 divisors (see below), whose sum is σ = 37316440. Its totient is φ = 10526256.

The previous prime is 21188053. The next prime is 21188093. The reversal of 21188092 is 29088112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21188093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16242 + ... + 17497.

Almost surely, 2^21188092 is an apocalyptic number.

It is an amenable number.

21188092 is a deficient number, since it is larger than the sum of its proper divisors (16128348).

21188092 is a wasteful number, since it uses less digits than its factorization.

21188092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33900 (or 33898 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 21188092 is about 4603.0524654842. The cubic root of 21188092 is about 276.7136714704.

The spelling of 21188092 in words is "twenty-one million, one hundred eighty-eight thousand, ninety-two".