2121022201121 has 2 divisors, whose sum is σ = 2121022201122. Its totient is φ = 2121022201120.

The previous prime is 2121022201091. The next prime is 2121022201153. The reversal of 2121022201121 is 1211022201212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1621789515025 + 499232686096 = 1273495^2 + 706564^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121022201121 - 2²⁶ = 2120955092257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2121022201121.

It is not a weakly prime, because it can be changed into another prime (2121022201171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060511100560 + 1060511100561.

It is an arithmetic number, because the mean of its divisors is an integer number (1060511100561).

Almost surely, 2^{2121022201121} is an apocalyptic number.

It is an amenable number.

2121022201121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121022201121 is an equidigital number, since it uses as much as digits as its factorization.

2121022201121 is an odious number, because the sum of its binary digits is odd.

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

Adding to 2121022201121 its reverse (1211022201212), we get a palindrome (3332044402333).

Subtracting from 2121022201121 its reverse (1211022201212), we obtain a palindrome (909999999909).

The spelling of 2121022201121 in words is "two trillion, one hundred twenty-one billion, twenty-two million, two hundred one thousand, one hundred twenty-one".