1200021102100 has 36 divisors (see below), whose sum is σ = 2621522641500. Its totient is φ = 476786901760.

The previous prime is 1200021102089. The next prime is 1200021102187. The reversal of 1200021102100 is 12011200021.

It can be written as a sum of positive squares in 6 ways, for example, as 76416862096 + 1123604240004 = 276436^2 + 1060002^2 .

It is a super-3 number, since 3×1200021102100³ (a number of 37 digits) contains 333 as substring.

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

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, 40254265 + ... + 40284064.

It is an arithmetic number, because the mean of its divisors is an integer number (72820073375).

Almost surely, 2^{1200021102100} is an apocalyptic number.

1200021102100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200021102100 is an abundant number, since it is smaller than the sum of its proper divisors (1421501539400).

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

1200021102100 is a wasteful number, since it uses less digits than its factorization.

1200021102100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80538492 (or 80538485 counting only the distinct ones).

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

Adding to 1200021102100 its reverse (12011200021), we get a palindrome (1212032302121).

The spelling of 1200021102100 in words is "one trillion, two hundred billion, twenty-one million, one hundred two thousand, one hundred".