2101220112100 has 36 divisors (see below), whose sum is σ = 4575209644404. Its totient is φ = 837619473280.

The previous prime is 2101220112091. The next prime is 2101220112133. The reversal of 2101220112100 is 12110221012.

It can be written as a sum of positive squares in 6 ways, for example, as 284660663296 + 1816559448804 = 533536^2 + 1347798^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35827699 + ... + 35886298.

It is an arithmetic number, because the mean of its divisors is an integer number (127089156789).

Almost surely, 2^{2101220112100} is an apocalyptic number.

2101220112100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101220112100 is an abundant number, since it is smaller than the sum of its proper divisors (2473989532304).

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

2101220112100 is a wasteful number, since it uses less digits than its factorization.

2101220112100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71714304 (or 71714297 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2101220112100 its reverse (12110221012), we get a palindrome (2113330333112).

The spelling of 2101220112100 in words is "two trillion, one hundred one billion, two hundred twenty million, one hundred twelve thousand, one hundred".