21933001 has 4 divisors (see below), whose sum is σ = 22004752. Its totient is φ = 21861252.

The previous prime is 21932993. The next prime is 21933013. The reversal of 21933001 is 10033912.

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 21933001 - 2³ = 21932993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21933001.

It is not an unprimeable number, because it can be changed into a prime (21933061) 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, 35415 + ... + 36028.

It is an arithmetic number, because the mean of its divisors is an integer number (5501188).

Almost surely, 2^21933001 is an apocalyptic number.

It is an amenable number.

21933001 is a deficient number, since it is larger than the sum of its proper divisors (71751).

21933001 is an equidigital number, since it uses as much as digits as its factorization.

21933001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71750.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 21933001 is about 4683.2681964628. The cubic root of 21933001 is about 279.9191986237.

Adding to 21933001 its reverse (10033912), we get a palindrome (31966913).

The spelling of 21933001 in words is "twenty-one million, nine hundred thirty-three thousand, one".