2113121122021 has 32 divisors (see below), whose sum is σ = 2740911667200. Its totient is φ = 1582035261120.

The previous prime is 2113121122003. The next prime is 2113121122043. The reversal of 2113121122021 is 1202211213112.

It is a cyclic number.

It is not a de Polignac number, because 2113121122021 - 2²⁷ = 2112986904293 is a prime.

It is a super-2 number, since 2×2113121122021² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 2113121122021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2113121122051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 722286 + ... + 2178976.

It is an arithmetic number, because the mean of its divisors is an integer number (85653489600).

Almost surely, 2^{2113121122021} is an apocalyptic number.

It is an amenable number.

2113121122021 is a deficient number, since it is larger than the sum of its proper divisors (627790545179).

2113121122021 is a wasteful number, since it uses less digits than its factorization.

2113121122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1457569.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 2113121122021 its reverse (1202211213112), we get a palindrome (3315332335133).

The spelling of 2113121122021 in words is "two trillion, one hundred thirteen billion, one hundred twenty-one million, one hundred twenty-two thousand, twenty-one".