2120121221123 has 16 divisors (see below), whose sum is σ = 2231145409536. Its totient is φ = 2011808154720.

The previous prime is 2120121221089. The next prime is 2120121221147. The reversal of 2120121221123 is 3211221210212.

It is a cyclic number.

It is not a de Polignac number, because 2120121221123 - 2²⁴ = 2120104443907 is a prime.

It is a super-2 number, since 2×2120121221123² (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 = 2120121221095 and 2120121221104.

It is not an unprimeable number, because it can be changed into a prime (2120121221623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2351840 + ... + 3125922.

It is an arithmetic number, because the mean of its divisors is an integer number (139446588096).

Almost surely, 2^{2120121221123} is an apocalyptic number.

2120121221123 is a deficient number, since it is larger than the sum of its proper divisors (111024188413).

2120121221123 is a wasteful number, since it uses less digits than its factorization.

2120121221123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775834.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 2120121221123 its reverse (3211221210212), we get a palindrome (5331342431335).

The spelling of 2120121221123 in words is "two trillion, one hundred twenty billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty-three".