103131111221 has 4 divisors (see below), whose sum is σ = 103918371744. Its totient is φ = 102343850700.

The previous prime is 103131111217. The next prime is 103131111233. The reversal of 103131111221 is 122111131301.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 103131111221 - 2² = 103131111217 is a prime.

It is a super-2 number, since 2×103131111221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 103131111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103131411221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 393630065 + ... + 393630326.

It is an arithmetic number, because the mean of its divisors is an integer number (25979592936).

Almost surely, 2^103131111221 is an apocalyptic number.

It is an amenable number.

103131111221 is a deficient number, since it is larger than the sum of its proper divisors (787260523).

103131111221 is an equidigital number, since it uses as much as digits as its factorization.

103131111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787260522.

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

Adding to 103131111221 its reverse (122111131301), we get a palindrome (225242242522).

The spelling of 103131111221 in words is "one hundred three billion, one hundred thirty-one million, one hundred eleven thousand, two hundred twenty-one".