2122221100121 has 4 divisors (see below), whose sum is σ = 2131026997044. Its totient is φ = 2113415203200.

The previous prime is 2122221100037. The next prime is 2122221100159. The reversal of 2122221100121 is 1210011222212.

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 1407934126096 + 714286974025 = 1186564^2 + 845155^2 .

It is a cyclic number.

It is not a de Polignac number, because 2122221100121 - 2³⁸ = 1847343193177 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2122221100121.

It is not an unprimeable number, because it can be changed into a prime (2122221100721) 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, 4402948100 + ... + 4402948581.

It is an arithmetic number, because the mean of its divisors is an integer number (532756749261).

Almost surely, 2^{2122221100121} is an apocalyptic number.

It is an amenable number.

2122221100121 is a deficient number, since it is larger than the sum of its proper divisors (8805896923).

2122221100121 is an equidigital number, since it uses as much as digits as its factorization.

2122221100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8805896922.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2122221100121 its reverse (1210011222212), we get a palindrome (3332232322333).

The spelling of 2122221100121 in words is "two trillion, one hundred twenty-two billion, two hundred twenty-one million, one hundred thousand, one hundred twenty-one".