12121120212220 has 24 divisors (see below), whose sum is σ = 26794055206800. Its totient is φ = 4593266606592.

The previous prime is 12121120212211. The next prime is 12121120212319. The reversal of 12121120212220 is 2221202112121.

It is a Harshad number since it is a multiple of its sum of digits (19).

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, 15948842005 + ... + 15948842764.

It is an arithmetic number, because the mean of its divisors is an integer number (1116418966950).

Almost surely, 2^{12121120212220} is an apocalyptic number.

12121120212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121120212220 is an abundant number, since it is smaller than the sum of its proper divisors (14672934994580).

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

12121120212220 is a wasteful number, since it uses less digits than its factorization.

12121120212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31897684797 (or 31897684795 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 12121120212220 its reverse (2221202112121), we get a palindrome (14342322324341).

The spelling of 12121120212220 in words is "twelve trillion, one hundred twenty-one billion, one hundred twenty million, two hundred twelve thousand, two hundred twenty".