22979821 has 2 divisors, whose sum is σ = 22979822. Its totient is φ = 22979820.

The previous prime is 22979819. The next prime is 22979833. The reversal of 22979821 is 12897922.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22944100 + 35721 = 4790^2 + 189^2 .

It is a cyclic number.

It is not a de Polignac number, because 22979821 - 2¹ = 22979819 is a prime.

Together with 22979819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22979881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11489910 + 11489911.

It is an arithmetic number, because the mean of its divisors is an integer number (11489911).

Almost surely, 2^22979821 is an apocalyptic number.

It is an amenable number.

22979821 is a deficient number, since it is larger than the sum of its proper divisors (1).

22979821 is an equidigital number, since it uses as much as digits as its factorization.

22979821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 40.

The square root of 22979821 is about 4793.7272554871. The cubic root of 22979821 is about 284.3035049669.

The spelling of 22979821 in words is "twenty-two million, nine hundred seventy-nine thousand, eight hundred twenty-one".