31230310221 has 24 divisors (see below), whose sum is σ = 50908347360. Its totient is φ = 18274788000.

The previous prime is 31230310219. The next prime is 31230310229. The reversal of 31230310221 is 12201303213.

It is not a de Polignac number, because 31230310221 - 2¹ = 31230310219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31230310194 and 31230310203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31230310229) 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, 5436055 + ... + 5441796.

It is an arithmetic number, because the mean of its divisors is an integer number (2121181140).

Almost surely, 2^31230310221 is an apocalyptic number.

It is an amenable number.

31230310221 is a deficient number, since it is larger than the sum of its proper divisors (19678037139).

31230310221 is a wasteful number, since it uses less digits than its factorization.

31230310221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10877897 (or 10877894 counting only the distinct ones).

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

Adding to 31230310221 its reverse (12201303213), we get a palindrome (43431613434).

The spelling of 31230310221 in words is "thirty-one billion, two hundred thirty million, three hundred ten thousand, two hundred twenty-one".