31321001223 has 24 divisors (see below), whose sum is σ = 45711675360. Its totient is φ = 20663841600.

The previous prime is 31321001221. The next prime is 31321001237. The reversal of 31321001223 is 32210012313.

It is not a de Polignac number, because 31321001223 - 2¹ = 31321001221 is a prime.

It is a super-2 number, since 2×31321001223² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31321001196 and 31321001205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321001221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2164390 + ... + 2178812.

It is an arithmetic number, because the mean of its divisors is an integer number (1904653140).

Almost surely, 2^31321001223 is an apocalyptic number.

31321001223 is a deficient number, since it is larger than the sum of its proper divisors (14390674137).

31321001223 is a wasteful number, since it uses less digits than its factorization.

31321001223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16919 (or 16916 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31321001223 its reverse (32210012313), we get a palindrome (63531013536).

The spelling of 31321001223 in words is "thirty-one billion, three hundred twenty-one million, one thousand, two hundred twenty-three".