21132084 has 24 divisors (see below), whose sum is σ = 49385728. Its totient is φ = 7032960.

The previous prime is 21132079. The next prime is 21132103. The reversal of 21132084 is 48023112.

It is a self number, because there is not a number n which added to its sum of digits gives 21132084.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 11004 + ... + 12780.

Almost surely, 2^21132084 is an apocalyptic number.

It is an amenable number.

21132084 is an abundant number, since it is smaller than the sum of its proper divisors (28253644).

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

21132084 is a wasteful number, since it uses less digits than its factorization.

21132084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2775 (or 2773 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 21132084 is about 4596.9646507233. The cubic root of 21132084 is about 276.4696373022.

Adding to 21132084 its reverse (48023112), we get a palindrome (69155196).

The spelling of 21132084 in words is "twenty-one million, one hundred thirty-two thousand, eighty-four".