2131002121 has 4 divisors (see below), whose sum is σ = 2165936644. Its totient is φ = 2096067600.

The previous prime is 2131002119. The next prime is 2131002191. The reversal of 2131002121 is 1212001312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 659205625 + 1471796496 = 25675^2 + 38364^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131002121 - 2¹ = 2131002119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2131002191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17467170 + ... + 17467291.

It is an arithmetic number, because the mean of its divisors is an integer number (541484161).

Almost surely, 2^2131002121 is an apocalyptic number.

It is an amenable number.

2131002121 is a deficient number, since it is larger than the sum of its proper divisors (34934523).

2131002121 is an equidigital number, since it uses as much as digits as its factorization.

2131002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34934522.

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

The square root of 2131002121 is about 46162.7785233948. The cubic root of 2131002121 is about 1286.8501000777.

Adding to 2131002121 its reverse (1212001312), we get a palindrome (3343003433).

The spelling of 2131002121 in words is "two billion, one hundred thirty-one million, two thousand, one hundred twenty-one".