21377084 has 24 divisors (see below), whose sum is σ = 38539200. Its totient is φ = 10370880.

The previous prime is 21377077. The next prime is 21377093. The reversal of 21377084 is 48077312.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21377084.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18722 + ... + 19830.

It is an arithmetic number, because the mean of its divisors is an integer number (1605800).

Almost surely, 2^21377084 is an apocalyptic number.

It is an amenable number.

21377084 is a deficient number, since it is larger than the sum of its proper divisors (17162116).

21377084 is a wasteful number, since it uses less digits than its factorization.

21377084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1253 (or 1251 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 21377084 is about 4623.5358763613. The cubic root of 21377084 is about 277.5339741430.

The spelling of 21377084 in words is "twenty-one million, three hundred seventy-seven thousand, eighty-four".