1111100021220 has 96 divisors (see below), whose sum is σ = 3559820479488. Its totient is φ = 253658547072.

The previous prime is 1111100021219. The next prime is 1111100021237. The reversal of 1111100021220 is 221200011111.

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

It is a junction number, because it is equal to n+sod(n) for n = 1111100021196 and 1111100021205.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1252102 + ... + 1946781.

It is an arithmetic number, because the mean of its divisors is an integer number (37081463328).

Almost surely, 2^{1111100021220} is an apocalyptic number.

1111100021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1111100021220 is an abundant number, since it is smaller than the sum of its proper divisors (2448720458268).

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

1111100021220 is a wasteful number, since it uses less digits than its factorization.

1111100021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3199729 (or 3199727 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1111100021220 its reverse (221200011111), we get a palindrome (1332300032331).

The spelling of 1111100021220 in words is "one trillion, one hundred eleven billion, one hundred million, twenty-one thousand, two hundred twenty".