21694792 has 32 divisors (see below), whose sum is σ = 47992320. Its totient is φ = 8997120.

The previous prime is 21694763. The next prime is 21694793. The reversal of 21694792 is 29749612.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21694793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4513 + ... + 7984.

It is an arithmetic number, because the mean of its divisors is an integer number (1499760).

Almost surely, 2^21694792 is an apocalyptic number.

It is an amenable number.

21694792 is an abundant number, since it is smaller than the sum of its proper divisors (26297528).

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

21694792 is a wasteful number, since it uses less digits than its factorization.

21694792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12541 (or 12537 counting only the distinct ones).

The product of its digits is 54432, while the sum is 40.

The square root of 21694792 is about 4657.7668468913. The cubic root of 21694792 is about 278.9021294845.

The spelling of 21694792 in words is "twenty-one million, six hundred ninety-four thousand, seven hundred ninety-two".