2131020121 has 4 divisors (see below), whose sum is σ = 2131202512. Its totient is φ = 2130837732.

The previous prime is 2131020061. The next prime is 2131020169. The reversal of 2131020121 is 1210201312.

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 2131020121 - 2²³ = 2122631513 is a prime.

It is a super-2 number, since 2×2131020121² = 9082493512213709282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2131021121) 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, 72375 + ... + 97468.

It is an arithmetic number, because the mean of its divisors is an integer number (532800628).

Almost surely, 2^2131020121 is an apocalyptic number.

It is an amenable number.

2131020121 is a deficient number, since it is larger than the sum of its proper divisors (182391).

2131020121 is a wasteful number, since it uses less digits than its factorization.

2131020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182390.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2131020121 is about 46162.9734852511. The cubic root of 2131020121 is about 1286.8537232927.

Adding to 2131020121 its reverse (1210201312), we get a palindrome (3341221433).

The spelling of 2131020121 in words is "two billion, one hundred thirty-one million, twenty thousand, one hundred twenty-one".