1200111002100 has 108 divisors (see below), whose sum is σ = 3807002961216. Its totient is φ = 316173802560.

The previous prime is 1200111002071. The next prime is 1200111002117. The reversal of 1200111002100 is 12001110021.

It is a happy number.

It is a super-2 number, since 2×1200111002100² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 7958172 + ... + 8107571.

Almost surely, 2^{1200111002100} is an apocalyptic number.

1200111002100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200111002100 is an abundant number, since it is smaller than the sum of its proper divisors (2606891959116).

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

1200111002100 is a wasteful number, since it uses less digits than its factorization.

1200111002100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16065846 (or 16065836 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1200111002100 its reverse (12001110021), we get a palindrome (1212112112121).

1200111002100 divided by its reverse (12001110021) gives a square (100 = 10²).

The spelling of 1200111002100 in words is "one trillion, two hundred billion, one hundred eleven million, two thousand, one hundred".