12020212021221 has 32 divisors (see below), whose sum is σ = 19180899584000. Its totient is φ = 7415161380144.

The previous prime is 12020212021211. The next prime is 12020212021229. The reversal of 12020212021221 is 12212021202021.

It is a happy number.

12020212021221 is a `hidden beast` number, since 120 + 202 + 120 + 2 + 1 + 221 = 666.

It is not a de Polignac number, because 12020212021221 - 2¹⁰ = 12020212020197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12020212021194 and 12020212021203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12020212021229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 272433901 + ... + 272478018.

It is an arithmetic number, because the mean of its divisors is an integer number (599403112000).

Almost surely, 2^{12020212021221} is an apocalyptic number.

It is an amenable number.

12020212021221 is a deficient number, since it is larger than the sum of its proper divisors (7160687562779).

12020212021221 is a wasteful number, since it uses less digits than its factorization.

12020212021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544911990 (or 544911984 counting only the distinct ones).

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

Adding to 12020212021221 its reverse (12212021202021), we get a palindrome (24232233223242).

The spelling of 12020212021221 in words is "twelve trillion, twenty billion, two hundred twelve million, twenty-one thousand, two hundred twenty-one".