31322010221 has 4 divisors (see below), whose sum is σ = 31368551772. Its totient is φ = 31275468672.

The previous prime is 31322010157. The next prime is 31322010233. The reversal of 31322010221 is 12201022313.

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 12407509321 + 18914500900 = 111389^2 + 137530^2 .

It is a cyclic number.

It is not a de Polignac number, because 31322010221 - 2⁶ = 31322010157 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 31322010221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31322013221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23269766 + ... + 23271111.

It is an arithmetic number, because the mean of its divisors is an integer number (7842137943).

Almost surely, 2^31322010221 is an apocalyptic number.

It is an amenable number.

31322010221 is a deficient number, since it is larger than the sum of its proper divisors (46541551).

31322010221 is an equidigital number, since it uses as much as digits as its factorization.

31322010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46541550.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 31322010221 its reverse (12201022313), we get a palindrome (43523032534).

The spelling of 31322010221 in words is "thirty-one billion, three hundred twenty-two million, ten thousand, two hundred twenty-one".