21979296 has 48 divisors (see below), whose sum is σ = 64108800. Its totient is φ = 7326144.

The previous prime is 21979289. The next prime is 21979297. The reversal of 21979296 is 69297912.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (21979297) 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, 11856 + ... + 13583.

It is an arithmetic number, because the mean of its divisors is an integer number (1335600).

Almost surely, 2^21979296 is an apocalyptic number.

It is an amenable number.

21979296 is an abundant number, since it is smaller than the sum of its proper divisors (42129504).

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

21979296 is a wasteful number, since it uses less digits than its factorization.

21979296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25458 (or 25444 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 21979296 is about 4688.2081865037. The cubic root of 21979296 is about 280.1160063527.

The spelling of 21979296 in words is "twenty-one million, nine hundred seventy-nine thousand, two hundred ninety-six".