31130223221 has 8 divisors (see below), whose sum is σ = 31483676160. Its totient is φ = 30776852128.

The previous prime is 31130223211. The next prime is 31130223227. The reversal of 31130223221 is 12232203113.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31130223221 is a prime.

It is a super-2 number, since 2×31130223221² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31130223193 and 31130223202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31130223227) 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, 1073900 + ... + 1102506.

It is an arithmetic number, because the mean of its divisors is an integer number (3935459520).

Almost surely, 2^31130223221 is an apocalyptic number.

It is an amenable number.

31130223221 is a deficient number, since it is larger than the sum of its proper divisors (353452939).

31130223221 is a wasteful number, since it uses less digits than its factorization.

31130223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40923.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31130223221 its reverse (12232203113), we get a palindrome (43362426334).

The spelling of 31130223221 in words is "thirty-one billion, one hundred thirty million, two hundred twenty-three thousand, two hundred twenty-one".