1011312220 has 12 divisors (see below), whose sum is σ = 2123755704. Its totient is φ = 404524880.

The previous prime is 1011312193. The next prime is 1011312223. The reversal of 1011312220 is 222131101.

It is a self number, because there is not a number n which added to its sum of digits gives 1011312220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011312223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25282786 + ... + 25282825.

It is an arithmetic number, because the mean of its divisors is an integer number (176979642).

Almost surely, 2^1011312220 is an apocalyptic number.

1011312220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011312220 is an abundant number, since it is smaller than the sum of its proper divisors (1112443484).

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

1011312220 is a wasteful number, since it uses less digits than its factorization.

1011312220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50565620 (or 50565618 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1011312220 is about 31801.1355143177. The cubic root of 1011312220 is about 1003.7566102085.

Adding to 1011312220 its reverse (222131101), we get a palindrome (1233443321).

The spelling of 1011312220 in words is "one billion, eleven million, three hundred twelve thousand, two hundred twenty".