21943562 has 8 divisors (see below), whose sum is σ = 32990976. Its totient is φ = 10946572.

The previous prime is 21943543. The next prime is 21943589. The reversal of 21943562 is 26534912.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 11498 + ... + 13269.

It is an arithmetic number, because the mean of its divisors is an integer number (4123872).

Almost surely, 2^21943562 is an apocalyptic number.

21943562 is a deficient number, since it is larger than the sum of its proper divisors (11047414).

21943562 is a wasteful number, since it uses less digits than its factorization.

21943562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25212.

The product of its digits is 12960, while the sum is 32.

The square root of 21943562 is about 4684.3955853450. The cubic root of 21943562 is about 279.9641195520.

The spelling of 21943562 in words is "twenty-one million, nine hundred forty-three thousand, five hundred sixty-two".