2121020010121 has 16 divisors (see below), whose sum is σ = 2174433378304. Its totient is φ = 2067794087184.

The previous prime is 2121020010113. The next prime is 2121020010139. The reversal of 2121020010121 is 1210100201212.

It is a cyclic number.

It is not a de Polignac number, because 2121020010121 - 2³ = 2121020010113 is a prime.

It is a super-4 number, since 4×2121020010121⁴ (a number of 50 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121020017121) 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, 166178686 + ... + 166191448.

It is an arithmetic number, because the mean of its divisors is an integer number (135902086144).

Almost surely, 2^{2121020010121} is an apocalyptic number.

It is an amenable number.

2121020010121 is a deficient number, since it is larger than the sum of its proper divisors (53413368183).

2121020010121 is a wasteful number, since it uses less digits than its factorization.

2121020010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19780.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2121020010121 its reverse (1210100201212), we get a palindrome (3331120211333).

The spelling of 2121020010121 in words is "two trillion, one hundred twenty-one billion, twenty million, ten thousand, one hundred twenty-one".