21668092 has 6 divisors (see below), whose sum is σ = 37919168. Its totient is φ = 10834044.

The previous prime is 21668033. The next prime is 21668099. The reversal of 21668092 is 29086612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21668099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2708508 + ... + 2708515.

Almost surely, 2^21668092 is an apocalyptic number.

It is an amenable number.

21668092 is a deficient number, since it is larger than the sum of its proper divisors (16251076).

21668092 is a wasteful number, since it uses less digits than its factorization.

21668092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5417027 (or 5417025 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 21668092 is about 4654.8997840985. The cubic root of 21668092 is about 278.7876666240.

The spelling of 21668092 in words is "twenty-one million, six hundred sixty-eight thousand, ninety-two".