131131221011 has 4 divisors (see below), whose sum is σ = 149864252592. Its totient is φ = 112398189432.

The previous prime is 131131220977. The next prime is 131131221017. The reversal of 131131221011 is 110122131131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110122131131 = 31799 ⋅3463069.

It is a cyclic number.

It is not a de Polignac number, because 131131221011 - 2⁶ = 131131220947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131131221017) 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, 9366515780 + ... + 9366515793.

It is an arithmetic number, because the mean of its divisors is an integer number (37466063148).

Almost surely, 2^131131221011 is an apocalyptic number.

131131221011 is a deficient number, since it is larger than the sum of its proper divisors (18733031581).

131131221011 is an equidigital number, since it uses as much as digits as its factorization.

131131221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18733031580.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 131131221011 its reverse (110122131131), we get a palindrome (241253352142).

The spelling of 131131221011 in words is "one hundred thirty-one billion, one hundred thirty-one million, two hundred twenty-one thousand, eleven".