111211210002100 has 72 divisors (see below), whose sum is σ = 259956688969208. Its totient is φ = 41052386649600.

The previous prime is 111211210001993. The next prime is 111211210002127. The reversal of 111211210002100 is 1200012112111.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 107555940162724 + 3655269839376 = 10370918^2 + 1911876^2 .

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

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, 5410239 + ... + 15864838.

Almost surely, 2^{111211210002100} is an apocalyptic number.

111211210002100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111211210002100 is an abundant number, since it is smaller than the sum of its proper divisors (148745478967108).

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

111211210002100 is a wasteful number, since it uses less digits than its factorization.

111211210002100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21279125 (or 21279118 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111211210002100 its reverse (1200012112111), we get a palindrome (112411222114211).

The spelling of 111211210002100 in words is "one hundred eleven trillion, two hundred eleven billion, two hundred ten million, two thousand, one hundred".