22158121 has 2 divisors, whose sum is σ = 22158122. Its totient is φ = 22158120.

The previous prime is 22158119. The next prime is 22158229. The reversal of 22158121 is 12185122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22090000 + 68121 = 4700^2 + 261^2 .

It is a cyclic number.

It is not a de Polignac number, because 22158121 - 2¹ = 22158119 is a prime.

Together with 22158119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 22158092 and 22158101.

It is not a weakly prime, because it can be changed into another prime (22158421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11079060 + 11079061.

It is an arithmetic number, because the mean of its divisors is an integer number (11079061).

Almost surely, 2^22158121 is an apocalyptic number.

It is an amenable number.

22158121 is a deficient number, since it is larger than the sum of its proper divisors (1).

22158121 is an equidigital number, since it uses as much as digits as its factorization.

22158121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 320, while the sum is 22.

The square root of 22158121 is about 4707.2413364942. The cubic root of 22158121 is about 280.8736361036.

The spelling of 22158121 in words is "twenty-two million, one hundred fifty-eight thousand, one hundred twenty-one".