22777921 has 2 divisors, whose sum is σ = 22777922. Its totient is φ = 22777920.

The previous prime is 22777913. The next prime is 22777927. The reversal of 22777921 is 12977722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13542400 + 9235521 = 3680^2 + 3039^2 .

It is a cyclic number.

It is not a de Polignac number, because 22777921 - 2³ = 22777913 is a prime.

It is not a weakly prime, because it can be changed into another prime (22777927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11388960 + 11388961.

It is an arithmetic number, because the mean of its divisors is an integer number (11388961).

Almost surely, 2^22777921 is an apocalyptic number.

It is an amenable number.

22777921 is a deficient number, since it is larger than the sum of its proper divisors (1).

22777921 is an equidigital number, since it uses as much as digits as its factorization.

22777921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24696, while the sum is 37.

The square root of 22777921 is about 4772.6220256794. The cubic root of 22777921 is about 283.4684272338.

The spelling of 22777921 in words is "twenty-two million, seven hundred seventy-seven thousand, nine hundred twenty-one".