31221220223223 has 32 divisors (see below), whose sum is σ = 47748154337280. Its totient is φ = 20141692839360.

The previous prime is 31221220223189. The next prime is 31221220223227. The reversal of 31221220223223 is 32232202212213.

31221220223223 is a `hidden beast` number, since 3 + 1 + 2 + 212 + 2 + 0 + 223 + 223 = 666.

It is not a de Polignac number, because 31221220223223 - 2¹⁷ = 31221220092151 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221220223227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15597915 + ... + 17485347.

It is an arithmetic number, because the mean of its divisors is an integer number (1492129823040).

Almost surely, 2^{31221220223223} is an apocalyptic number.

31221220223223 is a deficient number, since it is larger than the sum of its proper divisors (16526934114057).

31221220223223 is a wasteful number, since it uses less digits than its factorization.

31221220223223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1907236 (or 1907230 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 31221220223223 its reverse (32232202212213), we get a palindrome (63453422435436).

The spelling of 31221220223223 in words is "thirty-one trillion, two hundred twenty-one billion, two hundred twenty million, two hundred twenty-three thousand, two hundred twenty-three".