21930532 has 12 divisors (see below), whose sum is σ = 41330716. Its totient is φ = 10121760.

The previous prime is 21930511. The next prime is 21930553. The reversal of 21930532 is 23503912.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21930511) and next prime (21930553).

It can be written as a sum of positive squares in 2 ways, for example, as 8797156 + 13133376 = 2966^2 + 3624^2 .

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21930497 and 21930506.

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, 210819 + ... + 210922.

Almost surely, 2^21930532 is an apocalyptic number.

It is an amenable number.

21930532 is a deficient number, since it is larger than the sum of its proper divisors (19400184).

21930532 is a wasteful number, since it uses less digits than its factorization.

21930532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421758 (or 421756 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 21930532 is about 4683.0045910718. The cubic root of 21930532 is about 279.9086947193.

The spelling of 21930532 in words is "twenty-one million, nine hundred thirty thousand, five hundred thirty-two".