21793492 has 24 divisors (see below), whose sum is σ = 44241344. Its totient is φ = 9199872.

The previous prime is 21793487. The next prime is 21793501. The reversal of 21793492 is 29439712.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 3933 + ... + 7684.

Almost surely, 2^21793492 is an apocalyptic number.

It is an amenable number.

21793492 is an abundant number, since it is smaller than the sum of its proper divisors (22447852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21793492 is a wasteful number, since it uses less digits than its factorization.

21793492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11695 (or 11693 counting only the distinct ones).

The product of its digits is 27216, while the sum is 37.

The square root of 21793492 is about 4668.3500297214. The cubic root of 21793492 is about 279.3244428198.

It can be divided in two parts, 2179 and 3492, that added together give a triangular number (5671 = T₁₀₆).

The spelling of 21793492 in words is "twenty-one million, seven hundred ninety-three thousand, four hundred ninety-two".