22633721 has 4 divisors (see below), whose sum is σ = 24691344. Its totient is φ = 20576100.

The previous prime is 22633711. The next prime is 22633727. The reversal of 22633721 is 12733622.

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 a de Polignac number, because none of the positive numbers 2^k-22633721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22633727) 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, 1028795 + ... + 1028816.

It is an arithmetic number, because the mean of its divisors is an integer number (6172836).

Almost surely, 2^22633721 is an apocalyptic number.

It is an amenable number.

22633721 is a deficient number, since it is larger than the sum of its proper divisors (2057623).

22633721 is a wasteful number, since it uses less digits than its factorization.

22633721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2057622.

The product of its digits is 3024, while the sum is 26.

The square root of 22633721 is about 4757.4910404540. The cubic root of 22633721 is about 282.8689767108.

Subtracting from 22633721 its reverse (12733622), we obtain a palindrome (9900099).

The spelling of 22633721 in words is "twenty-two million, six hundred thirty-three thousand, seven hundred twenty-one".