31030103221 has 4 divisors (see below), whose sum is σ = 33417034252. Its totient is φ = 28643172192.

The previous prime is 31030103219. The next prime is 31030103231. The reversal of 31030103221 is 12230103013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12230103013 = 6983 ⋅1751411.

It can be written as a sum of positive squares in 2 ways, for example, as 9146818321 + 21883284900 = 95639^2 + 147930^2 .

It is a cyclic number.

It is not a de Polignac number, because 31030103221 - 2¹ = 31030103219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31030103195 and 31030103204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31030103231) 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, 1193465496 + ... + 1193465521.

It is an arithmetic number, because the mean of its divisors is an integer number (8354258563).

Almost surely, 2^31030103221 is an apocalyptic number.

It is an amenable number.

31030103221 is a deficient number, since it is larger than the sum of its proper divisors (2386931031).

31030103221 is a wasteful number, since it uses less digits than its factorization.

31030103221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2386931030.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31030103221 its reverse (12230103013), we get a palindrome (43260206234).

The spelling of 31030103221 in words is "thirty-one billion, thirty million, one hundred three thousand, two hundred twenty-one".