31220321223 has 16 divisors (see below), whose sum is σ = 51233348096. Its totient is φ = 16467861600.

The previous prime is 31220321213. The next prime is 31220321239. The reversal of 31220321223 is 32212302213.

It is a happy number.

It is not a de Polignac number, because 31220321223 - 2⁶ = 31220321159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 31220321223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220321203) 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 15 ways as a sum of consecutive naturals, for example, 57179803 + ... + 57180348.

It is an arithmetic number, because the mean of its divisors is an integer number (3202084256).

Almost surely, 2^31220321223 is an apocalyptic number.

31220321223 is a deficient number, since it is larger than the sum of its proper divisors (20013026873).

31220321223 is a wasteful number, since it uses less digits than its factorization.

31220321223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114360174.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 31220321223 its reverse (32212302213), we get a palindrome (63432623436).

The spelling of 31220321223 in words is "thirty-one billion, two hundred twenty million, three hundred twenty-one thousand, two hundred twenty-three".