23311021111220 has 48 divisors (see below), whose sum is σ = 51142581781200. Its totient is φ = 8913739699200.

The previous prime is 23311021111193. The next prime is 23311021111349. The reversal of 23311021111220 is 2211112011332.

It can be written as a sum of positive squares in 8 ways, for example, as 971143237156 + 22339877874064 = 985466^2 + 4726508^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 23311021111192 and 23311021111201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198908825 + ... + 199025984.

It is an arithmetic number, because the mean of its divisors is an integer number (1065470453775).

Almost surely, 2^{23311021111220} is an apocalyptic number.

23311021111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23311021111220 is an abundant number, since it is smaller than the sum of its proper divisors (27831560669980).

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

23311021111220 is a wasteful number, since it uses less digits than its factorization.

23311021111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397934948 (or 397934946 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 23311021111220 its reverse (2211112011332), we get a palindrome (25522133122552).

The spelling of 23311021111220 in words is "twenty-three trillion, three hundred eleven billion, twenty-one million, one hundred eleven thousand, two hundred twenty".