31230213231 has 16 divisors (see below), whose sum is σ = 47707584768. Its totient is φ = 17801328000.

The previous prime is 31230213191. The next prime is 31230213241. The reversal of 31230213231 is 13231203213.

It is a de Polignac number, because none of the positive numbers 2^k-31230213231 is a prime.

It is a super-2 number, since 2×31230213231² (a number of 22 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 31230213198 and 31230213207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31230213241) 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, 1845885 + ... + 1862726.

It is an arithmetic number, because the mean of its divisors is an integer number (2981724048).

Almost surely, 2^31230213231 is an apocalyptic number.

31230213231 is a deficient number, since it is larger than the sum of its proper divisors (16477371537).

31230213231 is a wasteful number, since it uses less digits than its factorization.

31230213231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3709022.

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

Adding to 31230213231 its reverse (13231203213), we get a palindrome (44461416444).

The spelling of 31230213231 in words is "thirty-one billion, two hundred thirty million, two hundred thirteen thousand, two hundred thirty-one".