22917121 has 2 divisors, whose sum is σ = 22917122. Its totient is φ = 22917120.

The previous prime is 22917107. The next prime is 22917143. The reversal of 22917121 is 12171922.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22667121 + 250000 = 4761^2 + 500^2 .

It is a cyclic number.

It is not a de Polignac number, because 22917121 - 2⁹ = 22916609 is a prime.

It is not a weakly prime, because it can be changed into another prime (22917101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11458560 + 11458561.

It is an arithmetic number, because the mean of its divisors is an integer number (11458561).

Almost surely, 2^22917121 is an apocalyptic number.

It is an amenable number.

22917121 is a deficient number, since it is larger than the sum of its proper divisors (1).

22917121 is an equidigital number, since it uses as much as digits as its factorization.

22917121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504, while the sum is 25.

The square root of 22917121 is about 4787.1829921155. The cubic root of 22917121 is about 284.0446972234.

The spelling of 22917121 in words is "twenty-two million, nine hundred seventeen thousand, one hundred twenty-one".