23111012220 has 24 divisors (see below), whose sum is σ = 64710834384. Its totient is φ = 6162936576.

The previous prime is 23111012207. The next prime is 23111012231. The reversal of 23111012220 is 2221011132.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 23111012220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192591709 + ... + 192591828.

It is an arithmetic number, because the mean of its divisors is an integer number (2696284766).

Almost surely, 2^23111012220 is an apocalyptic number.

23111012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23111012220 is an abundant number, since it is smaller than the sum of its proper divisors (41599822164).

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

23111012220 is a wasteful number, since it uses less digits than its factorization.

23111012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385183549 (or 385183547 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 23111012220 its reverse (2221011132), we get a palindrome (25332023352).

The spelling of 23111012220 in words is "twenty-three billion, one hundred eleven million, twelve thousand, two hundred twenty".