31323223221 has 8 divisors (see below), whose sum is σ = 41919556320. Its totient is φ = 20804519472.

The previous prime is 31323223213. The next prime is 31323223247. The reversal of 31323223221 is 12232232313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31323223221 - 2³ = 31323223213 is a prime.

It is a super-2 number, since 2×31323223221² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31323223191 and 31323223200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31323223291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19406395 + ... + 19408008.

It is an arithmetic number, because the mean of its divisors is an integer number (5239944540).

Almost surely, 2^31323223221 is an apocalyptic number.

It is an amenable number.

31323223221 is a deficient number, since it is larger than the sum of its proper divisors (10596333099).

31323223221 is a wasteful number, since it uses less digits than its factorization.

31323223221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38814675.

The product of its digits is 2592, while the sum is 24.

Adding to 31323223221 its reverse (12232232313), we get a palindrome (43555455534).

The spelling of 31323223221 in words is "thirty-one billion, three hundred twenty-three million, two hundred twenty-three thousand, two hundred twenty-one".