131103222221 has 4 divisors (see below), whose sum is σ = 131492252892. Its totient is φ = 130714191552.

The previous prime is 131103222209. The next prime is 131103222253. The reversal of 131103222221 is 122222301131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16731422500 + 114371799721 = 129350^2 + 338189^2 .

It is a cyclic number.

It is not a de Polignac number, because 131103222221 - 2¹⁴ = 131103205837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131103222193 and 131103222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131103222521) 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, 194514830 + ... + 194515503.

It is an arithmetic number, because the mean of its divisors is an integer number (32873063223).

Almost surely, 2^131103222221 is an apocalyptic number.

It is an amenable number.

131103222221 is a deficient number, since it is larger than the sum of its proper divisors (389030671).

131103222221 is an equidigital number, since it uses as much as digits as its factorization.

131103222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389030670.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 131103222221 its reverse (122222301131), we get a palindrome (253325523352).

The spelling of 131103222221 in words is "one hundred thirty-one billion, one hundred three million, two hundred twenty-two thousand, two hundred twenty-one".