12021021221220 has 108 divisors (see below), whose sum is σ = 40080005538300. Its totient is φ = 2914186957440.

The previous prime is 12021021221197. The next prime is 12021021221269. The reversal of 12021021221220 is 2212212012021.

It is a happy number.

12021021221220 is a `hidden beast` number, since 1 + 2 + 0 + 210 + 212 + 21 + 220 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4286092402944 + 7734928818276 = 2070288^2 + 2781174^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12021021221193 and 12021021221202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 275942895 + ... + 275986454.

Almost surely, 2^{12021021221220} is an apocalyptic number.

12021021221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12021021221220 is an abundant number, since it is smaller than the sum of its proper divisors (28058984317080).

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

12021021221220 is a wasteful number, since it uses less digits than its factorization.

12021021221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551929386 (or 551929370 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 12021021221220 its reverse (2212212012021), we get a palindrome (14233233233241).

The spelling of 12021021221220 in words is "twelve trillion, twenty-one billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty".