1111331111220 has 72 divisors (see below), whose sum is σ = 3677495683680. Its totient is φ = 269413602240.

The previous prime is 1111331111203. The next prime is 1111331111251. The reversal of 1111331111220 is 221111331111.

1111331111220 is a `hidden beast` number, since 1 + 1 + 1 + 1 + 331 + 111 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1111331111193 and 1111331111202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 280637190 + ... + 280641149.

It is an arithmetic number, because the mean of its divisors is an integer number (51076328940).

Almost surely, 2^{1111331111220} is an apocalyptic number.

1111331111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1111331111220 is an abundant number, since it is smaller than the sum of its proper divisors (2566164572460).

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

1111331111220 is a wasteful number, since it uses less digits than its factorization.

1111331111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561278365 (or 561278360 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

Adding to 1111331111220 its reverse (221111331111), we get a palindrome (1332442442331).

It can be divided in two parts, 111 and 1331111220, that added together give a palindrome (1331111331).

The spelling of 1111331111220 in words is "one trillion, one hundred eleven billion, three hundred thirty-one million, one hundred eleven thousand, two hundred twenty".