22138121 has 6 divisors (see below), whose sum is σ = 23143050. Its totient is φ = 21175088.

The previous prime is 22138093. The next prime is 22138133. The reversal of 22138121 is 12183122.

It can be written as a sum of positive squares in only one way, i.e., 21160000 + 978121 = 4600^2 + 989^2 .

It is not a de Polignac number, because 22138121 - 2¹⁸ = 21875977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22138093 and 22138102.

It is not an unprimeable number, because it can be changed into a prime (22138141) 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 in 5 ways as a sum of consecutive naturals, for example, 20396 + ... + 21453.

It is an arithmetic number, because the mean of its divisors is an integer number (3857175).

Almost surely, 2^22138121 is an apocalyptic number.

It is an amenable number.

22138121 is a deficient number, since it is larger than the sum of its proper divisors (1004929).

22138121 is an equidigital number, since it uses as much as digits as its factorization.

22138121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41895 (or 41872 counting only the distinct ones).

The product of its digits is 192, while the sum is 20.

The square root of 22138121 is about 4705.1164703969. The cubic root of 22138121 is about 280.7891048132.

The spelling of 22138121 in words is "twenty-two million, one hundred thirty-eight thousand, one hundred twenty-one".