22121002111121 has 4 divisors (see below), whose sum is σ = 22128810445092. Its totient is φ = 22113193777152.

The previous prime is 22121002111099. The next prime is 22121002111127. The reversal of 22121002111121 is 12111120012122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14432887276096 + 7688114835025 = 3799064^2 + 2772745^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22121002111121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22121002111121.

It is not an unprimeable number, because it can be changed into a prime (22121002111127) 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, 3904162736 + ... + 3904168401.

It is an arithmetic number, because the mean of its divisors is an integer number (5532202611273).

Almost surely, 2^{22121002111121} is an apocalyptic number.

It is an amenable number.

22121002111121 is a deficient number, since it is larger than the sum of its proper divisors (7808333971).

22121002111121 is an equidigital number, since it uses as much as digits as its factorization.

22121002111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7808333970.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 22121002111121 its reverse (12111120012122), we get a palindrome (34232122123243).

The spelling of 22121002111121 in words is "twenty-two trillion, one hundred twenty-one billion, two million, one hundred eleven thousand, one hundred twenty-one".