12213244231221 has 64 divisors (see below), whose sum is σ = 18786137702400. Its totient is φ = 6979989931200.

The previous prime is 12213244231219. The next prime is 12213244231247.

12213244231221 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 12213244231221 - 2¹ = 12213244231219 is a prime.

It is a super-2 number, since 2×12213244231221² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12213244233221) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1293908220 + ... + 1293917658.

It is an arithmetic number, because the mean of its divisors is an integer number (293533401600).

Almost surely, 2^{12213244231221} is an apocalyptic number.

12213244231221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12213244231221 is a deficient number, since it is larger than the sum of its proper divisors (6572893471179).

12213244231221 is a wasteful number, since it uses less digits than its factorization.

12213244231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18790.

The product of its digits is 9216, while the sum is 30.

It can be divided in two parts, 1221324 and 4231221, that added together give a palindrome (5452545).

The spelling of 12213244231221 in words is "twelve trillion, two hundred thirteen billion, two hundred forty-four million, two hundred thirty-one thousand, two hundred twenty-one".