2123126131 has 4 divisors (see below), whose sum is σ = 2426429872. Its totient is φ = 1819822392.

The previous prime is 2123126123. The next prime is 2123126143. The reversal of 2123126131 is 1316213212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2123126131 - 2³ = 2123126123 is a prime.

It is a super-2 number, since 2×2123126131² = 9015329136270058322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2123126231) 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, 151651860 + ... + 151651873.

It is an arithmetic number, because the mean of its divisors is an integer number (606607468).

Almost surely, 2^2123126131 is an apocalyptic number.

2123126131 is a deficient number, since it is larger than the sum of its proper divisors (303303741).

2123126131 is an equidigital number, since it uses as much as digits as its factorization.

2123126131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303303740.

The product of its digits is 432, while the sum is 22.

The square root of 2123126131 is about 46077.3928407413. The cubic root of 2123126131 is about 1285.2627826363.

Adding to 2123126131 its reverse (1316213212), we get a palindrome (3439339343).

The spelling of 2123126131 in words is "two billion, one hundred twenty-three million, one hundred twenty-six thousand, one hundred thirty-one".