21963432 has 16 divisors (see below), whose sum is σ = 54908640. Its totient is φ = 7321136.

The previous prime is 21963379. The next prime is 21963433. The reversal of 21963432 is 23436912.

It is a self number, because there is not a number n which added to its sum of digits gives 21963432.

It is not an unprimeable number, because it can be changed into a prime (21963433) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 457548 + ... + 457595.

It is an arithmetic number, because the mean of its divisors is an integer number (3431790).

Almost surely, 2^21963432 is an apocalyptic number.

It is an amenable number.

21963432 is an abundant number, since it is smaller than the sum of its proper divisors (32945208).

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

21963432 is a wasteful number, since it uses less digits than its factorization.

21963432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915152 (or 915148 counting only the distinct ones).

The product of its digits is 7776, while the sum is 30.

The square root of 21963432 is about 4686.5159767145. The cubic root of 21963432 is about 280.0485970072.

The spelling of 21963432 in words is "twenty-one million, nine hundred sixty-three thousand, four hundred thirty-two".