31221011323 has 4 divisors (see below), whose sum is σ = 31221550080. Its totient is φ = 31220472568.

The previous prime is 31221011317. The next prime is 31221011347. The reversal of 31221011323 is 32311012213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32311012213 = 127 ⋅254417419.

It is a cyclic number.

It is not a de Polignac number, because 31221011323 - 2³³ = 22631076731 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 31221011323.

It is not an unprimeable number, because it can be changed into a prime (31221011303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170308 + ... + 302401.

It is an arithmetic number, because the mean of its divisors is an integer number (7805387520).

Almost surely, 2^31221011323 is an apocalyptic number.

31221011323 is a deficient number, since it is larger than the sum of its proper divisors (538757).

31221011323 is an equidigital number, since it uses as much as digits as its factorization.

31221011323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538756.

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

Adding to 31221011323 its reverse (32311012213), we get a palindrome (63532023536).

The spelling of 31221011323 in words is "thirty-one billion, two hundred twenty-one million, eleven thousand, three hundred twenty-three".