2311011220 has 48 divisors (see below), whose sum is σ = 5586376320. Its totient is φ = 786639744.

The previous prime is 2311011203. The next prime is 2311011223. The reversal of 2311011220 is 221101132.

It is a self number, because there is not a number n which added to its sum of digits gives 2311011220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2311011223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39919 + ... + 78838.

It is an arithmetic number, because the mean of its divisors is an integer number (116382840).

Almost surely, 2^2311011220 is an apocalyptic number.

2311011220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2311011220 is an abundant number, since it is smaller than the sum of its proper divisors (3275365100).

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

2311011220 is a wasteful number, since it uses less digits than its factorization.

2311011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118912 (or 118910 counting only the distinct ones).

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

The square root of 2311011220 is about 48072.9780646051. The cubic root of 2311011220 is about 1322.1092731184.

Adding to 2311011220 its reverse (221101132), we get a palindrome (2532112352).

The spelling of 2311011220 in words is "two billion, three hundred eleven million, eleven thousand, two hundred twenty".