21080788 has 12 divisors (see below), whose sum is σ = 38495520. Its totient is φ = 10082072.

The previous prime is 21080777. The next prime is 21080789. The reversal of 21080788 is 88708012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21080789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114478 + ... + 114661.

It is an arithmetic number, because the mean of its divisors is an integer number (3207960).

Almost surely, 2^21080788 is an apocalyptic number.

It is an amenable number.

21080788 is a deficient number, since it is larger than the sum of its proper divisors (17414732).

21080788 is a wasteful number, since it uses less digits than its factorization.

21080788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229166 (or 229164 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 21080788 is about 4591.3819270455. The cubic root of 21080788 is about 276.2457553452.

The spelling of 21080788 in words is "twenty-one million, eighty thousand, seven hundred eighty-eight".