21564796 has 24 divisors (see below), whose sum is σ = 41421744. Its totient is φ = 9742080.

The previous prime is 21564793. The next prime is 21564929. The reversal of 21564796 is 69746512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21564793) 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, 6196 + ... + 9028.

It is an arithmetic number, because the mean of its divisors is an integer number (1725906).

Almost surely, 2^21564796 is an apocalyptic number.

It is an amenable number.

21564796 is a deficient number, since it is larger than the sum of its proper divisors (19856948).

21564796 is a wasteful number, since it uses less digits than its factorization.

21564796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3021 (or 3019 counting only the distinct ones).

The product of its digits is 90720, while the sum is 40.

The square root of 21564796 is about 4643.7911236403. The cubic root of 21564796 is about 278.3439491411.

The spelling of 21564796 in words is "twenty-one million, five hundred sixty-four thousand, seven hundred ninety-six".