31212322223 has 4 divisors (see below), whose sum is σ = 31290943080. Its totient is φ = 31133701368.

The previous prime is 31212322213. The next prime is 31212322231. The reversal of 31212322223 is 32222321213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31212322223 - 2¹⁶ = 31212256687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212322213) 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, 39309833 + ... + 39310626.

It is an arithmetic number, because the mean of its divisors is an integer number (7822735770).

Almost surely, 2^31212322223 is an apocalyptic number.

31212322223 is a deficient number, since it is larger than the sum of its proper divisors (78620857).

31212322223 is an equidigital number, since it uses as much as digits as its factorization.

31212322223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78620856.

The product of its digits is 1728, while the sum is 23.

Adding to 31212322223 its reverse (32222321213), we get a palindrome (63434643436).

The spelling of 31212322223 in words is "thirty-one billion, two hundred twelve million, three hundred twenty-two thousand, two hundred twenty-three".