1201111001100 has 108 divisors (see below), whose sum is σ = 3986275502664. Its totient is φ = 301455306240.

The previous prime is 1201111001087. The next prime is 1201111001119. The reversal of 1201111001100 is 11001111021.

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

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, 39236694 + ... + 39267293.

It is an arithmetic number, because the mean of its divisors is an integer number (36909958358).

Almost surely, 2^{1201111001100} is an apocalyptic number.

1201111001100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201111001100 is an abundant number, since it is smaller than the sum of its proper divisors (2785164501564).

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

1201111001100 is a wasteful number, since it uses less digits than its factorization.

1201111001100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78504024 (or 78504014 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 1201111001100 its reverse (11001111021), we get a palindrome (1212112112121).

It can be divided in two parts, 120111 and 1001100, that added together give a palindrome (1121211).

The spelling of 1201111001100 in words is "one trillion, two hundred one billion, one hundred eleven million, one thousand, one hundred".