131221213111 has 2 divisors, whose sum is σ = 131221213112. Its totient is φ = 131221213110.

The previous prime is 131221213073. The next prime is 131221213133. The reversal of 131221213111 is 111312122131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 131221213111 - 2¹⁷ = 131221082039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131221213411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65610606555 + 65610606556.

It is an arithmetic number, because the mean of its divisors is an integer number (65610606556).

Almost surely, 2^131221213111 is an apocalyptic number.

131221213111 is a deficient number, since it is larger than the sum of its proper divisors (1).

131221213111 is an equidigital number, since it uses as much as digits as its factorization.

131221213111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 19.

Adding to 131221213111 its reverse (111312122131), we get a palindrome (242533335242).

The spelling of 131221213111 in words is "one hundred thirty-one billion, two hundred twenty-one million, two hundred thirteen thousand, one hundred eleven".