1001220111100 has 72 divisors (see below), whose sum is σ = 2392312382208. Its totient is φ = 360677380800.

The previous prime is 1001220111097. The next prime is 1001220111103. The reversal of 1001220111100 is 11110221001.

It is an interprime number because it is at equal distance from previous prime (1001220111097) and next prime (1001220111103).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001220111103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4135572 + ... + 4370971.

It is an arithmetic number, because the mean of its divisors is an integer number (33226560864).

Almost surely, 2^{1001220111100} is an apocalyptic number.

1001220111100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001220111100 is an abundant number, since it is smaller than the sum of its proper divisors (1391092271108).

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

1001220111100 is a wasteful number, since it uses less digits than its factorization.

1001220111100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8506675 (or 8506668 counting only the distinct ones).

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

Adding to 1001220111100 its reverse (11110221001), we get a palindrome (1012330332101).

The spelling of 1001220111100 in words is "one trillion, one billion, two hundred twenty million, one hundred eleven thousand, one hundred".