23111311220 has 12 divisors (see below), whose sum is σ = 48533753604. Its totient is φ = 9244524480.

The previous prime is 23111311211. The next prime is 23111311231. The reversal of 23111311220 is 2211311132.

It can be written as a sum of positive squares in 2 ways, for example, as 6639642256 + 16471668964 = 81484^2 + 128342^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 577782761 + ... + 577782800.

It is an arithmetic number, because the mean of its divisors is an integer number (4044479467).

Almost surely, 2^23111311220 is an apocalyptic number.

23111311220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23111311220 is an abundant number, since it is smaller than the sum of its proper divisors (25422442384).

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

23111311220 is a wasteful number, since it uses less digits than its factorization.

23111311220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155565570 (or 1155565568 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 23111311220 its reverse (2211311132), we get a palindrome (25322622352).

The spelling of 23111311220 in words is "twenty-three billion, one hundred eleven million, three hundred eleven thousand, two hundred twenty".