23311111220 has 48 divisors (see below), whose sum is σ = 50113123200. Its totient is φ = 9105628800.

The previous prime is 23311111217. The next prime is 23311111231. The reversal of 23311111220 is 2211111332.

It is a super-2 number, since 2×23311111220² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112766 + ... + 243594.

It is an arithmetic number, because the mean of its divisors is an integer number (1044023400).

Almost surely, 2^23311111220 is an apocalyptic number.

23311111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23311111220 is an abundant number, since it is smaller than the sum of its proper divisors (26802011980).

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

23311111220 is a wasteful number, since it uses less digits than its factorization.

23311111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131048 (or 131046 counting only the distinct ones).

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

Adding to 23311111220 its reverse (2211111332), we get a palindrome (25522222552).

The spelling of 23311111220 in words is "twenty-three billion, three hundred eleven million, one hundred eleven thousand, two hundred twenty".