1100311220 has 24 divisors (see below), whose sum is σ = 2313045504. Its totient is φ = 439668896.

The previous prime is 1100311181. The next prime is 1100311249. The reversal of 1100311220 is 221130011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8324 + ... + 47643.

It is an arithmetic number, because the mean of its divisors is an integer number (96376896).

Almost surely, 2^1100311220 is an apocalyptic number.

1100311220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1100311220 is an abundant number, since it is smaller than the sum of its proper divisors (1212734284).

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

1100311220 is a wasteful number, since it uses less digits than its factorization.

1100311220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56959 (or 56957 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1100311220 is about 33170.9393897731. The cubic root of 1100311220 is about 1032.3774596758.

Adding to 1100311220 its reverse (221130011), we get a palindrome (1321441231).

The spelling of 1100311220 in words is "one billion, one hundred million, three hundred eleven thousand, two hundred twenty".