2113123220100 has 108 divisors (see below), whose sum is σ = 6629337192660. Its totient is φ = 563000140800.

The previous prime is 2113123220069. The next prime is 2113123220129. The reversal of 2113123220100 is 10223213112.

2113123220100 is a `hidden beast` number, since 21 + 1 + 312 + 322 + 0 + 10 + 0 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 686498416704 + 1426624803396 = 828552^2 + 1194414^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 23721 + ... + 2055920.

Almost surely, 2^{2113123220100} is an apocalyptic number.

2113123220100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2113123220100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3314668596330).

2113123220100 is an abundant number, since it is smaller than the sum of its proper divisors (4516213972560).

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

2113123220100 is a wasteful number, since it uses less digits than its factorization.

2113123220100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2080790 (or 2080780 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 2113123220100 its reverse (10223213112), we get a palindrome (2123346433212).

The spelling of 2113123220100 in words is "two trillion, one hundred thirteen billion, one hundred twenty-three million, two hundred twenty thousand, one hundred".