22128911256121 has 4 divisors (see below), whose sum is σ = 22128922925044. Its totient is φ = 22128899587200.

The previous prime is 22128911256083. The next prime is 22128911256161. The reversal of 22128911256121 is 12165211982122.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 9552667566121 + 12576243690000 = 3090739^2 + 3546300^2 .

It is a cyclic number.

It is not a de Polignac number, because 22128911256121 - 2¹⁷ = 22128911125049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22128911256161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2259840 + ... + 7026001.

It is an arithmetic number, because the mean of its divisors is an integer number (5532230731261).

Almost surely, 2^{22128911256121} is an apocalyptic number.

It is an amenable number.

22128911256121 is a deficient number, since it is larger than the sum of its proper divisors (11668923).

22128911256121 is an equidigital number, since it uses as much as digits as its factorization.

22128911256121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11668922.

The product of its digits is 69120, while the sum is 43.

The spelling of 22128911256121 in words is "twenty-two trillion, one hundred twenty-eight billion, nine hundred eleven million, two hundred fifty-six thousand, one hundred twenty-one".