2123129156 has 12 divisors (see below), whose sum is σ = 3776385900. Its totient is φ = 1044161760.

The previous prime is 2123129143. The next prime is 2123129159. The reversal of 2123129156 is 6519213212.

It can be written as a sum of positive squares in 2 ways, for example, as 40119556 + 2083009600 = 6334^2 + 45640^2 .

It is not an unprimeable number, because it can be changed into a prime (2123129159) 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, 4350431 + ... + 4350918.

It is an arithmetic number, because the mean of its divisors is an integer number (314698825).

Almost surely, 2^2123129156 is an apocalyptic number.

It is an amenable number.

2123129156 is a deficient number, since it is larger than the sum of its proper divisors (1653256744).

2123129156 is a wasteful number, since it uses less digits than its factorization.

2123129156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8701414 (or 8701412 counting only the distinct ones).

The product of its digits is 6480, while the sum is 32.

The square root of 2123129156 is about 46077.4256659375. The cubic root of 2123129156 is about 1285.2633930441.

The spelling of 2123129156 in words is "two billion, one hundred twenty-three million, one hundred twenty-nine thousand, one hundred fifty-six".