21942632 has 16 divisors (see below), whose sum is σ = 41707140. Its totient is φ = 10820736.

The previous prime is 21942629. The next prime is 21942649. The reversal of 21942632 is 23624912.

It can be written as a sum of positive squares in 2 ways, for example, as 19589476 + 2353156 = 4426^2 + 1534^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21942595 and 21942604.

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, 18203 + ... + 19370.

Almost surely, 2^21942632 is an apocalyptic number.

It is an amenable number.

21942632 is a deficient number, since it is larger than the sum of its proper divisors (19764508).

21942632 is a wasteful number, since it uses less digits than its factorization.

21942632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37652 (or 37648 counting only the distinct ones).

The product of its digits is 5184, while the sum is 29.

The square root of 21942632 is about 4684.2963185520. The cubic root of 21942632 is about 279.9601644009.

The spelling of 21942632 in words is "twenty-one million, nine hundred forty-two thousand, six hundred thirty-two".