21739132 has 12 divisors (see below), whose sum is σ = 38087896. Its totient is φ = 10856880.

The previous prime is 21739129. The next prime is 21739189. The reversal of 21739132 is 23193712.

It is a super-2 number, since 2×21739132² = 945179720226848, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21739132.

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, 1423 + ... + 6745.

Almost surely, 2^21739132 is an apocalyptic number.

It is an amenable number.

21739132 is a deficient number, since it is larger than the sum of its proper divisors (16348764).

21739132 is a wasteful number, since it uses less digits than its factorization.

21739132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6348 (or 6346 counting only the distinct ones).

The product of its digits is 2268, while the sum is 28.

The square root of 21739132 is about 4662.5242090524. The cubic root of 21739132 is about 279.0920076980.

The spelling of 21739132 in words is "twenty-one million, seven hundred thirty-nine thousand, one hundred thirty-two".