31230110221 has 8 divisors (see below), whose sum is σ = 32077335960. Its totient is φ = 30383051328.

The previous prime is 31230110213. The next prime is 31230110267. The reversal of 31230110221 is 12201103213.

It can be written as a sum of positive squares in 4 ways, for example, as 9852746121 + 21377364100 = 99261^2 + 146210^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31230110221 - 2³ = 31230110213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31230110195 and 31230110204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31230110291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400395 + ... + 471991.

It is an arithmetic number, because the mean of its divisors is an integer number (4009666995).

Almost surely, 2^31230110221 is an apocalyptic number.

It is an amenable number.

31230110221 is a deficient number, since it is larger than the sum of its proper divisors (847225739).

31230110221 is a wasteful number, since it uses less digits than its factorization.

31230110221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83423.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31230110221 its reverse (12201103213), we get a palindrome (43431213434).

The spelling of 31230110221 in words is "thirty-one billion, two hundred thirty million, one hundred ten thousand, two hundred twenty-one".