21943606 has 8 divisors (see below), whose sum is σ = 32950944. Its totient is φ = 10959960.

The previous prime is 21943589. The next prime is 21943609. The reversal of 21943606 is 60634912.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21943609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3390 + ... + 7441.

It is an arithmetic number, because the mean of its divisors is an integer number (4118868).

Almost surely, 2^21943606 is an apocalyptic number.

21943606 is a deficient number, since it is larger than the sum of its proper divisors (11007338).

21943606 is a wasteful number, since it uses less digits than its factorization.

21943606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11846.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 21943606 is about 4684.4002817863. The cubic root of 21943606 is about 279.9643066746.

The spelling of 21943606 in words is "twenty-one million, nine hundred forty-three thousand, six hundred six".