2131123230 has 128 divisors (see below), whose sum is σ = 6078188160. Its totient is φ = 529459200.

The previous prime is 2131123229. The next prime is 2131123231. The reversal of 2131123230 is 323211312.

It is an interprime number because it is at equal distance from previous prime (2131123229) and next prime (2131123231).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131123231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 461292 + ... + 465888.

It is an arithmetic number, because the mean of its divisors is an integer number (47485845).

Almost surely, 2^2131123230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2131123230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3039094080).

2131123230 is an abundant number, since it is smaller than the sum of its proper divisors (3947064930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2131123230 is a wasteful number, since it uses less digits than its factorization.

2131123230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4731 (or 4725 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 2131123230 is about 46164.0902650534. The cubic root of 2131123230 is about 1286.8744776815.

Adding to 2131123230 its reverse (323211312), we get a palindrome (2454334542).

The spelling of 2131123230 in words is "two billion, one hundred thirty-one million, one hundred twenty-three thousand, two hundred thirty".