13221212131 has 2 divisors, whose sum is σ = 13221212132. Its totient is φ = 13221212130.

The previous prime is 13221212129. The next prime is 13221212141. The reversal of 13221212131 is 13121212231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13221212131 - 2¹ = 13221212129 is a prime.

It is a super-2 number, since 2×13221212131² (a number of 21 digits) contains 22 as substring.

Together with 13221212129, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 13221212099 and 13221212108.

It is not a weakly prime, because it can be changed into another prime (13221212141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6610606065 + 6610606066.

It is an arithmetic number, because the mean of its divisors is an integer number (6610606066).

Almost surely, 2^13221212131 is an apocalyptic number.

13221212131 is a deficient number, since it is larger than the sum of its proper divisors (1).

13221212131 is an equidigital number, since it uses as much as digits as its factorization.

13221212131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 19.

Adding to 13221212131 its reverse (13121212231), we get a palindrome (26342424362).

The spelling of 13221212131 in words is "thirteen billion, two hundred twenty-one million, two hundred twelve thousand, one hundred thirty-one".