21943396 has 24 divisors (see below), whose sum is σ = 40805856. Its totient is φ = 10289280.

The previous prime is 21943391. The next prime is 21943399. The reversal of 21943396 is 69334912.

It is not an unprimeable number, because it can be changed into a prime (21943391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31411 + ... + 32101.

It is an arithmetic number, because the mean of its divisors is an integer number (1700244).

Almost surely, 2^21943396 is an apocalyptic number.

It is an amenable number.

21943396 is a deficient number, since it is larger than the sum of its proper divisors (18862460).

21943396 is a wasteful number, since it uses less digits than its factorization.

21943396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179 (or 1177 counting only the distinct ones).

The product of its digits is 34992, while the sum is 37.

The square root of 21943396 is about 4684.3778669104. The cubic root of 21943396 is about 279.9634135870.

The spelling of 21943396 in words is "twenty-one million, nine hundred forty-three thousand, three hundred ninety-six".