12211220321221 has 8 divisors (see below), whose sum is σ = 12515533063488. Its totient is φ = 11907216060000.

The previous prime is 12211220321219. The next prime is 12211220321269. The reversal of 12211220321221 is 12212302211221.

12211220321221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12211220321221 - 2¹ = 12211220321219 is a prime.

It is a super-2 number, since 2×12211220321221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12211220321192 and 12211220321201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211220321281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77040105 + ... + 77198446.

It is an arithmetic number, because the mean of its divisors is an integer number (1564441632936).

Almost surely, 2^{12211220321221} is an apocalyptic number.

It is an amenable number.

12211220321221 is a deficient number, since it is larger than the sum of its proper divisors (304312742267).

12211220321221 is a wasteful number, since it uses less digits than its factorization.

12211220321221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154240523.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 12211220321221 its reverse (12212302211221), we get a palindrome (24423522532442).

The spelling of 12211220321221 in words is "twelve trillion, two hundred eleven billion, two hundred twenty million, three hundred twenty-one thousand, two hundred twenty-one".