21842632 has 24 divisors (see below), whose sum is σ = 47642310. Its totient is φ = 9360960.

The previous prime is 21842593. The next prime is 21842651. The reversal of 21842632 is 23624812.

It can be written as a sum of positive squares in only one way, i.e., 11383876 + 10458756 = 3374^2 + 3234^2 .

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 21842632.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27469 + ... + 28252.

Almost surely, 2^21842632 is an apocalyptic number.

It is an amenable number.

21842632 is an abundant number, since it is smaller than the sum of its proper divisors (25799678).

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

21842632 is a wasteful number, since it uses less digits than its factorization.

21842632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55741 (or 55730 counting only the distinct ones).

The product of its digits is 4608, while the sum is 28.

The square root of 21842632 is about 4673.6101677397. The cubic root of 21842632 is about 279.5342256233.

The spelling of 21842632 in words is "twenty-one million, eight hundred forty-two thousand, six hundred thirty-two".