12123011220 has 24 divisors (see below), whose sum is σ = 33944431584. Its totient is φ = 3232802976.

The previous prime is 12123011213. The next prime is 12123011267. The reversal of 12123011220 is 2211032121.

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 12123011220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101025034 + ... + 101025153.

It is an arithmetic number, because the mean of its divisors is an integer number (1414351316).

Almost surely, 2^12123011220 is an apocalyptic number.

12123011220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12123011220 is an abundant number, since it is smaller than the sum of its proper divisors (21821420364).

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

12123011220 is a wasteful number, since it uses less digits than its factorization.

12123011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202050199 (or 202050197 counting only the distinct ones).

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

Adding to 12123011220 its reverse (2211032121), we get a palindrome (14334043341).

The spelling of 12123011220 in words is "twelve billion, one hundred twenty-three million, eleven thousand, two hundred twenty".