21179492 has 12 divisors (see below), whose sum is σ = 37173360. Its totient is φ = 10558536.

The previous prime is 21179491. The next prime is 21179507. The reversal of 21179492 is 29497112.

It is not an unprimeable number, because it can be changed into a prime (21179491) 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, 6242 + ... + 9017.

It is an arithmetic number, because the mean of its divisors is an integer number (3097780).

Almost surely, 2^21179492 is an apocalyptic number.

It is an amenable number.

21179492 is a deficient number, since it is larger than the sum of its proper divisors (15993868).

21179492 is a wasteful number, since it uses less digits than its factorization.

21179492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15610 (or 15608 counting only the distinct ones).

The product of its digits is 9072, while the sum is 35.

The square root of 21179492 is about 4602.1182079560. The cubic root of 21179492 is about 276.6762281175.

The spelling of 21179492 in words is "twenty-one million, one hundred seventy-nine thousand, four hundred ninety-two".