21940892 has 12 divisors (see below), whose sum is σ = 38970120. Its totient is φ = 10806576.

The previous prime is 21940843. The next prime is 21940909. The reversal of 21940892 is 29804912.

It is a congruent number.

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, 40667 + ... + 41202.

It is an arithmetic number, because the mean of its divisors is an integer number (3247510).

Almost surely, 2^21940892 is an apocalyptic number.

It is an amenable number.

21940892 is a deficient number, since it is larger than the sum of its proper divisors (17029228).

21940892 is a wasteful number, since it uses less digits than its factorization.

21940892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81940 (or 81938 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 21940892 is about 4684.1105879345. The cubic root of 21940892 is about 279.9527641406.

The spelling of 21940892 in words is "twenty-one million, nine hundred forty thousand, eight hundred ninety-two".