22123132121 has 4 divisors (see below), whose sum is σ = 23424492852. Its totient is φ = 20821771392.

The previous prime is 22123132091. The next prime is 22123132151. The reversal of 22123132121 is 12123132122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12123132122 = 2 ⋅6061566061.

It is an interprime number because it is at equal distance from previous prime (22123132091) and next prime (22123132151).

It can be written as a sum of positive squares in 2 ways, for example, as 18855409225 + 3267722896 = 137315^2 + 57164^2 .

It is a cyclic number.

It is not a de Polignac number, because 22123132121 - 2¹⁰ = 22123131097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22123132093 and 22123132102.

It is not an unprimeable number, because it can be changed into a prime (22123132151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 650680340 + ... + 650680373.

It is an arithmetic number, because the mean of its divisors is an integer number (5856123213).

Almost surely, 2^22123132121 is an apocalyptic number.

It is an amenable number.

22123132121 is a deficient number, since it is larger than the sum of its proper divisors (1301360731).

22123132121 is a wasteful number, since it uses less digits than its factorization.

22123132121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301360730.

The product of its digits is 288, while the sum is 20.

Adding to 22123132121 its reverse (12123132122), we get a palindrome (34246264243).

Subtracting from 22123132121 its reverse (12123132122), we obtain a palindrome (9999999999).

It can be divided in two parts, 221231 and 32121, that added together give a palindrome (253352).

The spelling of 22123132121 in words is "twenty-two billion, one hundred twenty-three million, one hundred thirty-two thousand, one hundred twenty-one".