2121102120121 has 4 divisors (see below), whose sum is σ = 2166231952512. Its totient is φ = 2075972287732.

The previous prime is 2121102120077. The next prime is 2121102120149. The reversal of 2121102120121 is 1210212011212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2121102120121 - 2²¹ = 2121100022969 is a prime.

It is a super-2 number, since 2×2121102120121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121102120095 and 2121102120104.

It is not an unprimeable number, because it can be changed into a prime (2121102120161) 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, 22564916125 + ... + 22564916218.

It is an arithmetic number, because the mean of its divisors is an integer number (541557988128).

Almost surely, 2^{2121102120121} is an apocalyptic number.

It is an amenable number.

2121102120121 is a deficient number, since it is larger than the sum of its proper divisors (45129832391).

2121102120121 is an equidigital number, since it uses as much as digits as its factorization.

2121102120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45129832390.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2121102120121 its reverse (1210212011212), we get a palindrome (3331314131333).

The spelling of 2121102120121 in words is "two trillion, one hundred twenty-one billion, one hundred two million, one hundred twenty thousand, one hundred twenty-one".