21939296 has 24 divisors (see below), whose sum is σ = 43298640. Its totient is φ = 10942848.

The previous prime is 21939277. The next prime is 21939361. The reversal of 21939296 is 69293912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22205 + ... + 23171.

It is an arithmetic number, because the mean of its divisors is an integer number (1804110).

Almost surely, 2^21939296 is an apocalyptic number.

It is an amenable number.

21939296 is a deficient number, since it is larger than the sum of its proper divisors (21359344).

21939296 is an equidigital number, since it uses as much as digits as its factorization.

21939296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686 (or 1678 counting only the distinct ones).

The product of its digits is 52488, while the sum is 41.

The square root of 21939296 is about 4683.9402216510. The cubic root of 21939296 is about 279.9459759717.

The spelling of 21939296 in words is "twenty-one million, nine hundred thirty-nine thousand, two hundred ninety-six".