21293192 has 16 divisors (see below), whose sum is σ = 41301900. Its totient is φ = 10279360.

The previous prime is 21293191. The next prime is 21293257. The reversal of 21293192 is 29139212.

It can be written as a sum of positive squares in 2 ways, for example, as 21104836 + 188356 = 4594^2 + 434^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (21293191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45659 + ... + 46122.

Almost surely, 2^21293192 is an apocalyptic number.

It is an amenable number.

21293192 is a deficient number, since it is larger than the sum of its proper divisors (20008708).

21293192 is a wasteful number, since it uses less digits than its factorization.

21293192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91816 (or 91812 counting only the distinct ones).

The product of its digits is 1944, while the sum is 29.

The square root of 21293192 is about 4614.4546806746. The cubic root of 21293192 is about 277.1704477337.

The spelling of 21293192 in words is "twenty-one million, two hundred ninety-three thousand, one hundred ninety-two".