21642092 has 12 divisors (see below), whose sum is σ = 39095616. Its totient is φ = 10471920.

The previous prime is 21642067. The next prime is 21642107. The reversal of 21642092 is 29024612.

It is a super-2 number, since 2×21642092² = 936760292272928, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87143 + ... + 87390.

It is an arithmetic number, because the mean of its divisors is an integer number (3257968).

Almost surely, 2^21642092 is an apocalyptic number.

It is an amenable number.

21642092 is a deficient number, since it is larger than the sum of its proper divisors (17453524).

21642092 is a wasteful number, since it uses less digits than its factorization.

21642092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174568 (or 174566 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 21642092 is about 4652.1061896737. The cubic root of 21642092 is about 278.6761142629.

The spelling of 21642092 in words is "twenty-one million, six hundred forty-two thousand, ninety-two".