1200111110020 has 24 divisors (see below), whose sum is σ = 2537147655000. Its totient is φ = 476822668032.

The previous prime is 1200111109993. The next prime is 1200111110021. The reversal of 1200111110020 is 200111110021.

It can be written as a sum of positive squares in 4 ways, for example, as 223840641924 + 976270468096 = 473118^2 + 988064^2 .

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 = 1200111109979 and 1200111110006.

It is not an unprimeable number, because it can be changed into a prime (1200111110021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201357945 + ... + 201363904.

It is an arithmetic number, because the mean of its divisors is an integer number (105714485625).

Almost surely, 2^{1200111110020} is an apocalyptic number.

1200111110020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200111110020 is an abundant number, since it is smaller than the sum of its proper divisors (1337036544980).

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

1200111110020 is a wasteful number, since it uses less digits than its factorization.

1200111110020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402722007 (or 402722005 counting only the distinct ones).

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

Adding to 1200111110020 its reverse (200111110021), we get a palindrome (1400222220041).

Subtracting from 1200111110020 its reverse (200111110021), we obtain a palindrome (999999999999).

It can be divided in two parts, 1200111 and 110020, that added together give a palindrome (1310131).

The spelling of 1200111110020 in words is "one trillion, two hundred billion, one hundred eleven million, one hundred ten thousand, twenty".