2122200022121 has 4 divisors (see below), whose sum is σ = 2122302322500. Its totient is φ = 2122097721744.

The previous prime is 2122200022091. The next prime is 2122200022211. The reversal of 2122200022121 is 1212200022212.

It is a happy number.

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 159780075625 + 1962419946496 = 399725^2 + 1400864^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2122200022121 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 2122200022121.

It is not an unprimeable number, because it can be changed into a prime (2122200021121) 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, 51119066 + ... + 51160563.

It is an arithmetic number, because the mean of its divisors is an integer number (530575580625).

Almost surely, 2^{2122200022121} is an apocalyptic number.

It is an amenable number.

2122200022121 is a deficient number, since it is larger than the sum of its proper divisors (102300379).

2122200022121 is a wasteful number, since it uses less digits than its factorization.

2122200022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102300378.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 2122200022121 its reverse (1212200022212), we get a palindrome (3334400044333).

Subtracting from 2122200022121 its reverse (1212200022212), we obtain a palindrome (909999999909).

The spelling of 2122200022121 in words is "two trillion, one hundred twenty-two billion, two hundred million, twenty-two thousand, one hundred twenty-one".