12212112021221 has 32 divisors (see below), whose sum is σ = 15344603289600. Its totient is φ = 9476417966400.

The previous prime is 12212112021211. The next prime is 12212112021247. The reversal of 12212112021221 is 12212021121221.

It is not a de Polignac number, because 12212112021221 - 2¹⁸ = 12212111759077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12212112021193 and 12212112021202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212112021211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1315775 + ... + 5114243.

It is an arithmetic number, because the mean of its divisors is an integer number (479518852800).

Almost surely, 2^{12212112021221} is an apocalyptic number.

It is an amenable number.

12212112021221 is a deficient number, since it is larger than the sum of its proper divisors (3132491268379).

12212112021221 is a wasteful number, since it uses less digits than its factorization.

12212112021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3799569.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 12212112021221 its reverse (12212021121221), we get a palindrome (24424133142442).

The spelling of 12212112021221 in words is "twelve trillion, two hundred twelve billion, one hundred twelve million, twenty-one thousand, two hundred twenty-one".