31303445221 has 8 divisors (see below), whose sum is σ = 31429593720. Its totient is φ = 31177428672.

The previous prime is 31303445177. The next prime is 31303445249. The reversal of 31303445221 is 12254430313.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 24082694596 + 7220750625 = 155186^2 + 84975^2 .

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 31303445221 - 2¹³ = 31303437029 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 31303445221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31303445291) 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 7 ways as a sum of consecutive naturals, for example, 457011 + ... + 521023.

It is an arithmetic number, because the mean of its divisors is an integer number (3928699215).

Almost surely, 2^31303445221 is an apocalyptic number.

It is an amenable number.

31303445221 is a deficient number, since it is larger than the sum of its proper divisors (126148499).

31303445221 is a wasteful number, since it uses less digits than its factorization.

31303445221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65975.

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 31303445221 its reverse (12254430313), we get a palindrome (43557875534).

The spelling of 31303445221 in words is "thirty-one billion, three hundred three million, four hundred forty-five thousand, two hundred twenty-one".