1200021112100 has 72 divisors (see below), whose sum is σ = 2741823991200. Its totient is φ = 454624876800.

The previous prime is 1200021112099. The next prime is 1200021112117. The reversal of 1200021112100 is 12111200021.

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, 7292531 + ... + 7455269.

Almost surely, 2^{1200021112100} is an apocalyptic number.

1200021112100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1200021112100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1370911995600).

1200021112100 is an abundant number, since it is smaller than the sum of its proper divisors (1541802879100).

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

1200021112100 is a wasteful number, since it uses less digits than its factorization.

1200021112100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166653 (or 166646 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1200021112100 its reverse (12111200021), we get a palindrome (1212132312121).

The spelling of 1200021112100 in words is "one trillion, two hundred billion, twenty-one million, one hundred twelve thousand, one hundred".