12021212120220 has 72 divisors (see below), whose sum is σ = 36464627131296. Its totient is φ = 3205631624832.

The previous prime is 12021212120191. The next prime is 12021212120273. The reversal of 12021212120220 is 2202121212021.

It is a happy number.

12021212120220 is a `hidden beast` number, since 1 + 20 + 212 + 1 + 212 + 0 + 220 = 666.

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 = 12021212120193 and 12021212120202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41822514 + ... + 42108966.

Almost surely, 2^{12021212120220} is an apocalyptic number.

12021212120220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12021212120220 is an abundant number, since it is smaller than the sum of its proper divisors (24443415011076).

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

12021212120220 is a wasteful number, since it uses less digits than its factorization.

12021212120220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519611 (or 519606 counting only the distinct ones).

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

Adding to 12021212120220 its reverse (2202121212021), we get a palindrome (14223333332241).

The spelling of 12021212120220 in words is "twelve trillion, twenty-one billion, two hundred twelve million, one hundred twenty thousand, two hundred twenty".