1201200020100 has 54 divisors (see below), whose sum is σ = 3765094732490. Its totient is φ = 320320005120.

The previous prime is 1201200020089. The next prime is 1201200020123. The reversal of 1201200020100 is 10200021021.

It can be written as a sum of positive squares in 3 ways, for example, as 755480196 + 1200444539904 = 27486^2 + 1095648^2 .

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 17 ways as a sum of consecutive naturals, for example, 667332445 + ... + 667334244.

Almost surely, 2^{1201200020100} is an apocalyptic number.

1201200020100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201200020100 is an abundant number, since it is smaller than the sum of its proper divisors (2563894712390).

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

1201200020100 is a wasteful number, since it uses less digits than its factorization.

1201200020100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1334666709 (or 1334666699 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 1201200020100 its reverse (10200021021), we get a palindrome (1211400041121).

The spelling of 1201200020100 in words is "one trillion, two hundred one billion, two hundred million, twenty thousand, one hundred".