1001220111200 has 72 divisors (see below), whose sum is σ = 2445417420768. Its totient is φ = 400293255680.

The previous prime is 1001220111191. The next prime is 1001220111257. The reversal of 1001220111200 is 21110221001.

It is a super-2 number, since 2×1001220111200² (a number of 25 digits) contains 22 as substring.

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, 1347074 + ... + 1953726.

It is an arithmetic number, because the mean of its divisors is an integer number (33964130844).

Almost surely, 2^{1001220111200} is an apocalyptic number.

1001220111200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001220111200 is an abundant number, since it is smaller than the sum of its proper divisors (1444197309568).

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

1001220111200 is a wasteful number, since it uses less digits than its factorization.

1001220111200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608736 (or 608723 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1001220111200 its reverse (21110221001), we get a palindrome (1022330332201).

The spelling of 1001220111200 in words is "one trillion, one billion, two hundred twenty million, one hundred eleven thousand, two hundred".