21837132 has 18 divisors (see below), whose sum is σ = 55199508. Its totient is φ = 7279032.

The previous prime is 21837119. The next prime is 21837149. The reversal of 21837132 is 23173812.

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 21837096 and 21837105.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 303258 + ... + 303329.

Almost surely, 2^21837132 is an apocalyptic number.

It is an amenable number.

21837132 is an abundant number, since it is smaller than the sum of its proper divisors (33362376).

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

21837132 is a wasteful number, since it uses less digits than its factorization.

21837132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606597 (or 606592 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 21837132 is about 4673.0217204717. The cubic root of 21837132 is about 279.5107613066.

The spelling of 21837132 in words is "twenty-one million, eight hundred thirty-seven thousand, one hundred thirty-two".