1201100111020 has 24 divisors (see below), whose sum is σ = 2522797477200. Its totient is φ = 480347236032.

The previous prime is 1201100110981. The next prime is 1201100111033. The reversal of 1201100111020 is 201110011021.

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

It is a junction number, because it is equal to n+sod(n) for n = 1201100110988 and 1201100111006.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5694355 + ... + 5901514.

It is an arithmetic number, because the mean of its divisors is an integer number (105116561550).

Almost surely, 2^{1201100111020} is an apocalyptic number.

1201100111020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201100111020 is an abundant number, since it is smaller than the sum of its proper divisors (1321697366180).

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

1201100111020 is a wasteful number, since it uses less digits than its factorization.

1201100111020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11601057 (or 11601055 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1201100111020 its reverse (201110011021), we get a palindrome (1402210122041).

Subtracting from 1201100111020 its reverse (201110011021), we obtain a palindrome (999990099999).

It can be divided in two parts, 12011001 and 11020, that added together give a palindrome (12022021).

The spelling of 1201100111020 in words is "one trillion, two hundred one billion, one hundred million, one hundred eleven thousand, twenty".