31321031223 has 16 divisors (see below), whose sum is σ = 41851869696. Its totient is φ = 20835491040.

The previous prime is 31321031219. The next prime is 31321031249. The reversal of 31321031223 is 32213012313.

It is not a de Polignac number, because 31321031223 - 2² = 31321031219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31321031223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321031263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2918838 + ... + 2929548.

It is an arithmetic number, because the mean of its divisors is an integer number (2615741856).

Almost surely, 2^31321031223 is an apocalyptic number.

31321031223 is a deficient number, since it is larger than the sum of its proper divisors (10530838473).

31321031223 is a wasteful number, since it uses less digits than its factorization.

31321031223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12734.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31321031223 its reverse (32213012313), we get a palindrome (63534043536).

The spelling of 31321031223 in words is "thirty-one billion, three hundred twenty-one million, thirty-one thousand, two hundred twenty-three".