21537084 has 12 divisors (see below), whose sum is σ = 50253224. Its totient is φ = 7179024.

The previous prime is 21537073. The next prime is 21537091. The reversal of 21537084 is 48073512.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 897367 + ... + 897390.

Almost surely, 2^21537084 is an apocalyptic number.

It is an amenable number.

21537084 is an abundant number, since it is smaller than the sum of its proper divisors (28716140).

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

21537084 is a wasteful number, since it uses less digits than its factorization.

21537084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1794764 (or 1794762 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 21537084 is about 4640.8063954447. The cubic root of 21537084 is about 278.2246687182.

The spelling of 21537084 in words is "twenty-one million, five hundred thirty-seven thousand, eighty-four".