21791692 has 24 divisors (see below), whose sum is σ = 41849136. Its totient is φ = 9866688.

The previous prime is 21791687. The next prime is 21791699. The reversal of 21791692 is 29619712.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (21791699) 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 in 7 ways as a sum of consecutive naturals, for example, 1198 + ... + 6709.

It is an arithmetic number, because the mean of its divisors is an integer number (1743714).

Almost surely, 2^21791692 is an apocalyptic number.

It is an amenable number.

21791692 is a deficient number, since it is larger than the sum of its proper divisors (20057444).

21791692 is a wasteful number, since it uses less digits than its factorization.

21791692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7977 (or 7975 counting only the distinct ones).

The product of its digits is 13608, while the sum is 37.

The square root of 21791692 is about 4668.1572381401. The cubic root of 21791692 is about 279.3167524836.

The spelling of 21791692 in words is "twenty-one million, seven hundred ninety-one thousand, six hundred ninety-two".