2100000111220 has 36 divisors (see below), whose sum is σ = 4847355634212. Its totient is φ = 763636403200.

The previous prime is 2100000111169. The next prime is 2100000111239. The reversal of 2100000111220 is 221110000012.

It can be written as a sum of positive squares in 2 ways, for example, as 992378577124 + 1107621534096 = 996182^2 + 1052436^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 2100000111197 and 2100000111206.

It is a congruent number.

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, 433881901 + ... + 433886740.

It is an arithmetic number, because the mean of its divisors is an integer number (134648767617).

Almost surely, 2^{2100000111220} is an apocalyptic number.

2100000111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100000111220 is an abundant number, since it is smaller than the sum of its proper divisors (2747355522992).

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

2100000111220 is a wasteful number, since it uses less digits than its factorization.

2100000111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867768672 (or 867768659 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 2100000111220 its reverse (221110000012), we get a palindrome (2321110111232).

The spelling of 2100000111220 in words is "two trillion, one hundred billion, one hundred eleven thousand, two hundred twenty".