31103312221 has 8 divisors (see below), whose sum is σ = 31133909888. Its totient is φ = 31072734000.

The previous prime is 31103312209. The next prime is 31103312281. The reversal of 31103312221 is 12221330113.

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 31103312221 - 2¹⁷ = 31103181149 is a prime.

It is a super-2 number, since 2×31103312221² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31103312281) 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, 7349176 + ... + 7353406.

It is an arithmetic number, because the mean of its divisors is an integer number (3891738736).

Almost surely, 2^31103312221 is an apocalyptic number.

It is an amenable number.

31103312221 is a deficient number, since it is larger than the sum of its proper divisors (30597667).

31103312221 is a wasteful number, since it uses less digits than its factorization.

31103312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9723.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31103312221 its reverse (12221330113), we get a palindrome (43324642334).

The spelling of 31103312221 in words is "thirty-one billion, one hundred three million, three hundred twelve thousand, two hundred twenty-one".