2131500100 has 18 divisors (see below), whose sum is σ = 4625355434. Its totient is φ = 852600000.

The previous prime is 2131500097. The next prime is 2131500101. The reversal of 2131500100 is 10051312.

It can be written as a sum of positive squares in 3 ways, for example, as 15876 + 2131484224 = 126^2 + 46168^2 .

It is not an unprimeable number, because it can be changed into a prime (2131500101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10657401 + ... + 10657600.

Almost surely, 2^2131500100 is an apocalyptic number.

2131500100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2131500100 is an abundant number, since it is smaller than the sum of its proper divisors (2493855334).

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

2131500100 is a wasteful number, since it uses less digits than its factorization.

2131500100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21315015 (or 21315008 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 2131500100 is about 46168.1719369524. The cubic root of 2131500100 is about 1286.9503306077.

Adding to 2131500100 its reverse (10051312), we get a palindrome (2141551412).

It can be divided in two parts, 2131500 and 100, that added together give a square (2131600 = 1460²).

The spelling of 2131500100 in words is "two billion, one hundred thirty-one million, five hundred thousand, one hundred".