131121002100 has 72 divisors (see below), whose sum is σ = 413865573408. Its totient is φ = 31786908800.

The previous prime is 131121002093. The next prime is 131121002101. The reversal of 131121002100 is 1200121131.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131121002101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19863519 + ... + 19870118.

It is an arithmetic number, because the mean of its divisors is an integer number (5748132964).

Almost surely, 2^131121002100 is an apocalyptic number.

131121002100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131121002100 is an abundant number, since it is smaller than the sum of its proper divisors (282744571308).

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

131121002100 is a wasteful number, since it uses less digits than its factorization.

131121002100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39733665 (or 39733658 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 131121002100 its reverse (1200121131), we get a palindrome (132321123231).

The spelling of 131121002100 in words is "one hundred thirty-one billion, one hundred twenty-one million, two thousand, one hundred".