21360988 has 24 divisors (see below), whose sum is σ = 41885424. Its totient is φ = 9446400.

The previous prime is 21360971. The next prime is 21361001. The reversal of 21360988 is 88906312.

It is a super-2 number, since 2×21360988² = 912583616672288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4933 + ... + 8188.

It is an arithmetic number, because the mean of its divisors is an integer number (1745226).

Almost surely, 2^21360988 is an apocalyptic number.

It is an amenable number.

21360988 is a deficient number, since it is larger than the sum of its proper divisors (20524436).

21360988 is a wasteful number, since it uses less digits than its factorization.

21360988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13173 (or 13171 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 21360988 is about 4621.7948894342. The cubic root of 21360988 is about 277.4642997117.

The spelling of 21360988 in words is "twenty-one million, three hundred sixty thousand, nine hundred eighty-eight".