12210220021221 has 24 divisors (see below), whose sum is σ = 17662066456320. Its totient is φ = 8128578614400.

The previous prime is 12210220021217. The next prime is 12210220021229. The reversal of 12210220021221 is 12212002201221.

It is a happy number.

12210220021221 is a `hidden beast` number, since 1 + 2 + 210 + 220 + 0 + 212 + 21 = 666.

It is not a de Polignac number, because 12210220021221 - 2² = 12210220021217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12210220021194 and 12210220021203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12210220021229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17529676 + ... + 18212906.

It is an arithmetic number, because the mean of its divisors is an integer number (735919435680).

Almost surely, 2^{12210220021221} is an apocalyptic number.

It is an amenable number.

12210220021221 is a deficient number, since it is larger than the sum of its proper divisors (5451846435099).

12210220021221 is a wasteful number, since it uses less digits than its factorization.

12210220021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686057 (or 686054 counting only the distinct ones).

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

Adding to 12210220021221 its reverse (12212002201221), we get a palindrome (24422222222442).

The spelling of 12210220021221 in words is "twelve trillion, two hundred ten billion, two hundred twenty million, twenty-one thousand, two hundred twenty-one".