2131123020 has 48 divisors (see below), whose sum is σ = 6426157920. Its totient is φ = 524583936.

The previous prime is 2131123019. The next prime is 2131123037. The reversal of 2131123020 is 203211312.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1365325 + ... + 1366884.

It is an arithmetic number, because the mean of its divisors is an integer number (133878290).

Almost surely, 2^2131123020 is an apocalyptic number.

2131123020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2131123020 is an abundant number, since it is smaller than the sum of its proper divisors (4295034900).

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

2131123020 is a wasteful number, since it uses less digits than its factorization.

2131123020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2732234 (or 2732232 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 2131123020 is about 46164.0879905582. The cubic root of 2131123020 is about 1286.8744354122.

Adding to 2131123020 its reverse (203211312), we get a palindrome (2334334332).

The spelling of 2131123020 in words is "two billion, one hundred thirty-one million, one hundred twenty-three thousand, twenty".