2131424121 has 4 divisors (see below), whose sum is σ = 2841898832. Its totient is φ = 1420949412.

The previous prime is 2131424117. The next prime is 2131424131. The reversal of 2131424121 is 1214241312.

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 not a de Polignac number, because 2131424121 - 2² = 2131424117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2131424101) 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, 355237351 + ... + 355237356.

It is an arithmetic number, because the mean of its divisors is an integer number (710474708).

Almost surely, 2^2131424121 is an apocalyptic number.

It is an amenable number.

2131424121 is a deficient number, since it is larger than the sum of its proper divisors (710474711).

2131424121 is an equidigital number, since it uses as much as digits as its factorization.

2131424121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710474710.

The product of its digits is 384, while the sum is 21.

The square root of 2131424121 is about 46167.3490791923. The cubic root of 2131424121 is about 1286.9350389732.

Adding to 2131424121 its reverse (1214241312), we get a palindrome (3345665433).

The spelling of 2131424121 in words is "two billion, one hundred thirty-one million, four hundred twenty-four thousand, one hundred twenty-one".