2131220120100 has 72 divisors (see below), whose sum is σ = 6166834255680. Its totient is φ = 568278910080.

The previous prime is 2131220120093. The next prime is 2131220120143. The reversal of 2131220120100 is 10210221312.

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

It is a self number, because there is not a number n which added to its sum of digits gives 2131220120100.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3466806 + ... + 4034994.

Almost surely, 2^{2131220120100} is an apocalyptic number.

2131220120100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2131220120100 is an abundant number, since it is smaller than the sum of its proper divisors (4035614135580).

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

2131220120100 is a wasteful number, since it uses less digits than its factorization.

2131220120100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580709 (or 580702 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 2131220120100 its reverse (10210221312), we get a palindrome (2141430341412).

The spelling of 2131220120100 in words is "two trillion, one hundred thirty-one billion, two hundred twenty million, one hundred twenty thousand, one hundred".