1000111220 has 24 divisors (see below), whose sum is σ = 2105649000. Its totient is φ = 399012992.

The previous prime is 1000111213. The next prime is 1000111223. The reversal of 1000111220 is 221110001.

It can be written as a sum of positive squares in 4 ways, for example, as 37994896 + 962116324 = 6164^2 + 31018^2 .

It is a super-3 number, since 3×1000111220³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1000111198 and 1000111207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000111223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56495 + ... + 72054.

It is an arithmetic number, because the mean of its divisors is an integer number (87735375).

Almost surely, 2^1000111220 is an apocalyptic number.

1000111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1000111220 is an abundant number, since it is smaller than the sum of its proper divisors (1105537780).

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

1000111220 is a wasteful number, since it uses less digits than its factorization.

1000111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128947 (or 128945 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1000111220 is about 31624.5350953971. The cubic root of 1000111220 is about 1000.0370719590.

Adding to 1000111220 its reverse (221110001), we get a palindrome (1221221221).

The spelling of 1000111220 in words is "one billion, one hundred eleven thousand, two hundred twenty".