22222222222121 has 4 divisors (see below), whose sum is σ = 22321873443072. Its totient is φ = 22122571001172.

The previous prime is 22222222222103. The next prime is 22222222222153. The reversal of 22222222222121 is 12122222222222.

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 a cyclic number.

It is not a de Polignac number, because 22222222222121 - 2²² = 22222218027817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22222222222181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49825610141 + ... + 49825610586.

It is an arithmetic number, because the mean of its divisors is an integer number (5580468360768).

Almost surely, 2^{22222222222121} is an apocalyptic number.

It is an amenable number.

22222222222121 is a deficient number, since it is larger than the sum of its proper divisors (99651220951).

22222222222121 is an equidigital number, since it uses as much as digits as its factorization.

22222222222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99651220950.

The product of its digits is 4096, while the sum is 26.

Adding to 22222222222121 its reverse (12122222222222), we get a palindrome (34344444444343).

It can be divided in two parts, 22222222222 and 121, that multiplied together give a palindrome (2688888888862).

The spelling of 22222222222121 in words is "twenty-two trillion, two hundred twenty-two billion, two hundred twenty-two million, two hundred twenty-two thousand, one hundred twenty-one".