12121222121220 has 96 divisors (see below), whose sum is σ = 35118921720960. Its totient is φ = 3121681812480.

The previous prime is 12121222121219. The next prime is 12121222121249. The reversal of 12121222121220 is 2212122212121.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26164471 + ... + 26623710.

It is an arithmetic number, because the mean of its divisors is an integer number (365822101260).

Almost surely, 2^{12121222121220} is an apocalyptic number.

12121222121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121222121220 is an abundant number, since it is smaller than the sum of its proper divisors (22997699599740).

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

12121222121220 is a wasteful number, since it uses less digits than its factorization.

12121222121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52788325 (or 52788323 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 12121222121220 its reverse (2212122212121), we get a palindrome (14333344333341).

Subtracting from 12121222121220 its reverse (2212122212121), we obtain a palindrome (9909099909099).

The spelling of 12121222121220 in words is "twelve trillion, one hundred twenty-one billion, two hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty".