2311223220 has 120 divisors (see below), whose sum is σ = 7294662144. Its totient is φ = 612563904.

The previous prime is 2311223203. The next prime is 2311223231. The reversal of 2311223220 is 223221132.

2311223220 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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 = 2311223193 and 2311223202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 266269 + ... + 274811.

Almost surely, 2^2311223220 is an apocalyptic number.

2311223220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2311223220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3647331072).

2311223220 is an abundant number, since it is smaller than the sum of its proper divisors (4983438924).

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

2311223220 is a wasteful number, since it uses less digits than its factorization.

2311223220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8731 (or 8720 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 2311223220 is about 48075.1829949715. The cubic root of 2311223220 is about 1322.1496996632.

Adding to 2311223220 its reverse (223221132), we get a palindrome (2534444352).

The spelling of 2311223220 in words is "two billion, three hundred eleven million, two hundred twenty-three thousand, two hundred twenty".