21933697 has 4 divisors (see below), whose sum is σ = 22887360. Its totient is φ = 20980036.

The previous prime is 21933683. The next prime is 21933707. The reversal of 21933697 is 79633912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21933697 - 2²³ = 13545089 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21933607) 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, 476797 + ... + 476842.

It is an arithmetic number, because the mean of its divisors is an integer number (5721840).

Almost surely, 2^21933697 is an apocalyptic number.

It is an amenable number.

21933697 is a deficient number, since it is larger than the sum of its proper divisors (953663).

21933697 is an equidigital number, since it uses as much as digits as its factorization.

21933697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953662.

The product of its digits is 61236, while the sum is 40.

The square root of 21933697 is about 4683.3425029566. The cubic root of 21933697 is about 279.9221594846.

The spelling of 21933697 in words is "twenty-one million, nine hundred thirty-three thousand, six hundred ninety-seven".