21856296 has 64 divisors (see below), whose sum is σ = 68129280. Its totient is φ = 5676480.

The previous prime is 21856277. The next prime is 21856337. The reversal of 21856296 is 69265812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4066 + ... + 7761.

It is an arithmetic number, because the mean of its divisors is an integer number (1064520).

Almost surely, 2^21856296 is an apocalyptic number.

It is an amenable number.

21856296 is an abundant number, since it is smaller than the sum of its proper divisors (46272984).

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

21856296 is a wasteful number, since it uses less digits than its factorization.

21856296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11854 (or 11850 counting only the distinct ones).

The product of its digits is 51840, while the sum is 39.

The square root of 21856296 is about 4675.0717641551. The cubic root of 21856296 is about 279.5925024750.

The spelling of 21856296 in words is "twenty-one million, eight hundred fifty-six thousand, two hundred ninety-six".