12121233220 has 24 divisors (see below), whose sum is σ = 26561312064. Its totient is φ = 4637689056.

The previous prime is 12121233191. The next prime is 12121233221. The reversal of 12121233220 is 2233212121.

It is not an unprimeable number, because it can be changed into a prime (12121233221) 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, 13174794 + ... + 13175713.

It is an arithmetic number, because the mean of its divisors is an integer number (1106721336).

Almost surely, 2^12121233220 is an apocalyptic number.

12121233220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121233220 is an abundant number, since it is smaller than the sum of its proper divisors (14440078844).

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

12121233220 is a wasteful number, since it uses less digits than its factorization.

12121233220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26350539 (or 26350537 counting only the distinct ones).

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

Adding to 12121233220 its reverse (2233212121), we get a palindrome (14354445341).

The spelling of 12121233220 in words is "twelve billion, one hundred twenty-one million, two hundred thirty-three thousand, two hundred twenty".