22121122112121 has 4 divisors (see below), whose sum is σ = 29494829482832. Its totient is φ = 14747414741412.

The previous prime is 22121122112101. The next prime is 22121122112123. The reversal of 22121122112121 is 12121122112122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 22121122112121 - 2¹⁰ = 22121122111097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22121122112123) 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, 3686853685351 + ... + 3686853685356.

It is an arithmetic number, because the mean of its divisors is an integer number (7373707370708).

Almost surely, 2^{22121122112121} is an apocalyptic number.

It is an amenable number.

22121122112121 is a deficient number, since it is larger than the sum of its proper divisors (7373707370711).

22121122112121 is an equidigital number, since it uses as much as digits as its factorization.

22121122112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7373707370710.

The product of its digits is 128, while the sum is 21.

Adding to 22121122112121 its reverse (12121122112122), we get a palindrome (34242244224243).

Subtracting from 22121122112121 its reverse (12121122112122), we obtain a palindrome (9999999999999).

The spelling of 22121122112121 in words is "twenty-two trillion, one hundred twenty-one billion, one hundred twenty-two million, one hundred twelve thousand, one hundred twenty-one".