12213455431221 has 48 divisors (see below), whose sum is σ = 19891488509568. Its totient is φ = 7156164412800.

The previous prime is 12213455431183. The next prime is 12213455431223.

12213455431221 is a `hidden beast` number, since 1 + 2 + 21 + 34 + 554 + 31 + 2 + 21 = 666.

12213455431221 is nontrivially palindromic in base 10.

12213455431221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12213455431221 - 2³⁸ = 11938577524277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12213455431223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10043625 + ... + 11193806.

It is an arithmetic number, because the mean of its divisors is an integer number (414406010616).

Almost surely, 2^{12213455431221} is an apocalyptic number.

12213455431221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12213455431221 is a deficient number, since it is larger than the sum of its proper divisors (7678033078347).

12213455431221 is a wasteful number, since it uses less digits than its factorization.

12213455431221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21237642 (or 21237639 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

It can be divided in two parts, 1221345 and 5431221, that added together give a palindrome (6652566).

The spelling of 12213455431221 in words is "twelve trillion, two hundred thirteen billion, four hundred fifty-five million, four hundred thirty-one thousand, two hundred twenty-one".