23123211220 has 24 divisors (see below), whose sum is σ = 48584529000. Its totient is φ = 9244372992.

The previous prime is 23123211193. The next prime is 23123211227. The reversal of 23123211220 is 2211232132.

It can be written as a sum of positive squares in 4 ways, for example, as 2803278916 + 20319932304 = 52946^2 + 142548^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23123211227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268245 + ... + 343804.

It is an arithmetic number, because the mean of its divisors is an integer number (2024355375).

Almost surely, 2^23123211220 is an apocalyptic number.

23123211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23123211220 is an abundant number, since it is smaller than the sum of its proper divisors (25461317780).

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

23123211220 is a wasteful number, since it uses less digits than its factorization.

23123211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613947 (or 613945 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 23123211220 its reverse (2211232132), we get a palindrome (25334443352).

It can be divided in two parts, 231232112 and 20, that added together give a palindrome (231232132).

The spelling of 23123211220 in words is "twenty-three billion, one hundred twenty-three million, two hundred eleven thousand, two hundred twenty".