2131121200 has 60 divisors (see below), whose sum is σ = 5513879728. Its totient is φ = 786873600.

The previous prime is 2131121183. The next prime is 2131121203. The reversal of 2131121200 is 21211312.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (2131121203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 199716 + ... + 210115.

Almost surely, 2^2131121200 is an apocalyptic number.

2131121200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2131121200 is an abundant number, since it is smaller than the sum of its proper divisors (3382758528).

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

2131121200 is a wasteful number, since it uses less digits than its factorization.

2131121200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409862 (or 409851 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2131121200 is about 46164.0682782616. The cubic root of 2131121200 is about 1286.8740690776.

Adding to 2131121200 its reverse (21211312), we get a palindrome (2152332512).

The spelling of 2131121200 in words is "two billion, one hundred thirty-one million, one hundred twenty-one thousand, two hundred".