22726821 has 16 divisors (see below), whose sum is σ = 32860800. Its totient is φ = 13888320.

The previous prime is 22726817. The next prime is 22726853. The reversal of 22726821 is 12862722.

It is not a de Polignac number, because 22726821 - 2² = 22726817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22726861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3856 + ... + 7766.

It is an arithmetic number, because the mean of its divisors is an integer number (2053800).

Almost surely, 2^22726821 is an apocalyptic number.

It is an amenable number.

22726821 is a deficient number, since it is larger than the sum of its proper divisors (10133979).

22726821 is a wasteful number, since it uses less digits than its factorization.

22726821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4076.

The product of its digits is 5376, while the sum is 30.

The square root of 22726821 is about 4767.2655684365. The cubic root of 22726821 is about 283.2562907791.

The spelling of 22726821 in words is "twenty-two million, seven hundred twenty-six thousand, eight hundred twenty-one".