12021221121220 has 24 divisors (see below), whose sum is σ = 25342792242264. Its totient is φ = 4789778374656.

The previous prime is 12021221121181. The next prime is 12021221121233. The reversal of 12021221121220 is 2212112212021.

It can be written as a sum of positive squares in 4 ways, for example, as 6024589886016 + 5996631235204 = 2454504^2 + 2448802^2 .

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, 1169374347 + ... + 1169384626.

It is an arithmetic number, because the mean of its divisors is an integer number (1055949676761).

Almost surely, 2^{12021221121220} is an apocalyptic number.

12021221121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12021221121220 is an abundant number, since it is smaller than the sum of its proper divisors (13321571121044).

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

12021221121220 is a wasteful number, since it uses less digits than its factorization.

12021221121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2338759239 (or 2338759237 counting only the distinct ones).

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

Adding to 12021221121220 its reverse (2212112212021), we get a palindrome (14233333333241).

The spelling of 12021221121220 in words is "twelve trillion, twenty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty".