21320092 has 6 divisors (see below), whose sum is σ = 37310168. Its totient is φ = 10660044.

The previous prime is 21320083. The next prime is 21320099. The reversal of 21320092 is 29002312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2665008 + ... + 2665015.

Almost surely, 2^21320092 is an apocalyptic number.

It is an amenable number.

21320092 is a deficient number, since it is larger than the sum of its proper divisors (15990076).

21320092 is a wasteful number, since it uses less digits than its factorization.

21320092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5330027 (or 5330025 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 21320092 is about 4617.3685146412. The cubic root of 21320092 is about 277.2871164407.

The spelling of 21320092 in words is "twenty-one million, three hundred twenty thousand, ninety-two".