131221232111 has 4 divisors (see below), whose sum is σ = 131954311800. Its totient is φ = 130488152424.

The previous prime is 131221232071. The next prime is 131221232159. The reversal of 131221232111 is 111232122131.

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

It is a cyclic number.

It is not a de Polignac number, because 131221232111 - 2¹⁸ = 131220969967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131221232161) 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, 366539576 + ... + 366539933.

It is an arithmetic number, because the mean of its divisors is an integer number (32988577950).

Almost surely, 2^131221232111 is an apocalyptic number.

131221232111 is a deficient number, since it is larger than the sum of its proper divisors (733079689).

131221232111 is an equidigital number, since it uses as much as digits as its factorization.

131221232111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733079688.

The product of its digits is 144, while the sum is 20.

Adding to 131221232111 its reverse (111232122131), we get a palindrome (242453354242).

The spelling of 131221232111 in words is "one hundred thirty-one billion, two hundred twenty-one million, two hundred thirty-two thousand, one hundred eleven".