12121120220 has 24 divisors (see below), whose sum is σ = 27768385008. Its totient is φ = 4407680000.

The previous prime is 12121120217. The next prime is 12121120247. The reversal of 12121120220 is 2202112121.

It is a junction number, because it is equal to n+sod(n) for n = 12121120195 and 12121120204.

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, 27547781 + ... + 27548220.

It is an arithmetic number, because the mean of its divisors is an integer number (1157016042).

Almost surely, 2^12121120220 is an apocalyptic number.

12121120220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121120220 is an abundant number, since it is smaller than the sum of its proper divisors (15647264788).

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

12121120220 is a wasteful number, since it uses less digits than its factorization.

12121120220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55096021 (or 55096019 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12121120220 its reverse (2202112121), we get a palindrome (14323232341).

The spelling of 12121120220 in words is "twelve billion, one hundred twenty-one million, one hundred twenty thousand, two hundred twenty".