1021111111200 has 144 divisors (see below), whose sum is σ = 3413547144000. Its totient is φ = 264936913920.

The previous prime is 1021111111183. The next prime is 1021111111213. The reversal of 1021111111200 is 21111111201.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5660700 + ... + 5838299.

It is an arithmetic number, because the mean of its divisors is an integer number (23705188500).

Almost surely, 2^{1021111111200} is an apocalyptic number.

1021111111200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021111111200 is an abundant number, since it is smaller than the sum of its proper divisors (2392436032800).

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

1021111111200 is a wasteful number, since it uses less digits than its factorization.

1021111111200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11499059 (or 11499046 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 1021111111200 its reverse (21111111201), we get a palindrome (1042222222401).

Subtracting from 1021111111200 its reverse (21111111201), we obtain a palindrome (999999999999).

It can be divided in two parts, 1021111 and 111200, that added together give a palindrome (1132311).

The spelling of 1021111111200 in words is "one trillion, twenty-one billion, one hundred eleven million, one hundred eleven thousand, two hundred".