131221121111 has 8 divisors (see below), whose sum is σ = 132605447184. Its totient is φ = 129837438720.

The previous prime is 131221120993. The next prime is 131221121113. The reversal of 131221121111 is 111121122131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131221121111 - 2³⁰ = 130147379287 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 131221121111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131221121113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254576 + ... + 572058.

It is an arithmetic number, because the mean of its divisors is an integer number (16575680898).

Almost surely, 2^131221121111 is an apocalyptic number.

131221121111 is a deficient number, since it is larger than the sum of its proper divisors (1384326073).

131221121111 is an equidigital number, since it uses as much as digits as its factorization.

131221121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321841.

The product of its digits is 24, while the sum is 17.

Adding to 131221121111 its reverse (111121122131), we get a palindrome (242342243242).

The spelling of 131221121111 in words is "one hundred thirty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred eleven".