21008796 has 12 divisors (see below), whose sum is σ = 49020552. Its totient is φ = 7002928.

The previous prime is 21008773. The next prime is 21008797. The reversal of 21008796 is 69780012.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21008797) 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, 875355 + ... + 875378.

It is an arithmetic number, because the mean of its divisors is an integer number (4085046).

Almost surely, 2^21008796 is an apocalyptic number.

It is an amenable number.

21008796 is an abundant number, since it is smaller than the sum of its proper divisors (28011756).

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

21008796 is a wasteful number, since it uses less digits than its factorization.

21008796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750740 (or 1750738 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 21008796 is about 4583.5353167615. The cubic root of 21008796 is about 275.9309320979.

The spelling of 21008796 in words is "twenty-one million, eight thousand, seven hundred ninety-six".