131021321111 has 4 divisors (see below), whose sum is σ = 131410108752. Its totient is φ = 130632533472.

The previous prime is 131021321107. The next prime is 131021321159. The reversal of 131021321111 is 111123120131.

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 131021321111 - 2² = 131021321107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131021321111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131021321311) 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, 194393315 + ... + 194393988.

It is an arithmetic number, because the mean of its divisors is an integer number (32852527188).

Almost surely, 2^131021321111 is an apocalyptic number.

131021321111 is a deficient number, since it is larger than the sum of its proper divisors (388787641).

131021321111 is an equidigital number, since it uses as much as digits as its factorization.

131021321111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388787640.

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

Adding to 131021321111 its reverse (111123120131), we get a palindrome (242144441242).

The spelling of 131021321111 in words is "one hundred thirty-one billion, twenty-one million, three hundred twenty-one thousand, one hundred eleven".