21966432 has 48 divisors (see below), whose sum is σ = 60701760. Its totient is φ = 6936192.

The previous prime is 21966401. The next prime is 21966463. The reversal of 21966432 is 23466912.

It is an interprime number because it is at equal distance from previous prime (21966401) and next prime (21966463).

It is a tau number, because it is divible by the number of its divisors (48).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21966393 and 21966402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4198 + ... + 7845.

It is an arithmetic number, because the mean of its divisors is an integer number (1264620).

Almost surely, 2^21966432 is an apocalyptic number.

It is an amenable number.

21966432 is an abundant number, since it is smaller than the sum of its proper divisors (38735328).

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

21966432 is a wasteful number, since it uses less digits than its factorization.

21966432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12075 (or 12067 counting only the distinct ones).

The product of its digits is 15552, while the sum is 33.

The square root of 21966432 is about 4686.8360329758. The cubic root of 21966432 is about 280.0613471023.

The spelling of 21966432 in words is "twenty-one million, nine hundred sixty-six thousand, four hundred thirty-two".