12221332131221 has 4 divisors (see below), whose sum is σ = 12221395991532. Its totient is φ = 12221268270912.

The previous prime is 12221332131181. The next prime is 12221332131223. The reversal of 12221332131221 is 12213123312221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4282772304196 + 7938559827025 = 2069486^2 + 2817545^2 .

It is a cyclic number.

It is not a de Polignac number, because 12221332131221 - 2³⁴ = 12204152262037 is a prime.

It is a super-2 number, since 2×12221332131221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221332131223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31642226 + ... + 32026131.

It is an arithmetic number, because the mean of its divisors is an integer number (3055348997883).

Almost surely, 2^{12221332131221} is an apocalyptic number.

It is an amenable number.

12221332131221 is a deficient number, since it is larger than the sum of its proper divisors (63860311).

12221332131221 is an equidigital number, since it uses as much as digits as its factorization.

12221332131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63860310.

The product of its digits is 1728, while the sum is 26.

Adding to 12221332131221 its reverse (12213123312221), we get a palindrome (24434455443442).

The spelling of 12221332131221 in words is "twelve trillion, two hundred twenty-one billion, three hundred thirty-two million, one hundred thirty-one thousand, two hundred twenty-one".