2101123131021 has 12 divisors (see below), whose sum is σ = 3147361398272. Its totient is φ = 1400748753852.

The previous prime is 2101123131001. The next prime is 2101123131059. The reversal of 2101123131021 is 1201313211012.

2101123131021 is a `hidden beast` number, since 2 + 101 + 1 + 231 + 310 + 21 = 666.

It is not a de Polignac number, because 2101123131021 - 2⁶ = 2101123130957 is a prime.

It is a super-2 number, since 2×2101123131021² (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 = 2101123130985 and 2101123131003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101123131001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4323298381 + ... + 4323298866.

Almost surely, 2^{2101123131021} is an apocalyptic number.

It is an amenable number.

2101123131021 is a deficient number, since it is larger than the sum of its proper divisors (1046238267251).

2101123131021 is an frugal number, since it uses more digits than its factorization.

2101123131021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8646597262 (or 8646597250 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 2101123131021 its reverse (1201313211012), we get a palindrome (3302436342033).

The spelling of 2101123131021 in words is "two trillion, one hundred one billion, one hundred twenty-three million, one hundred thirty-one thousand, twenty-one".