31130222221 has 8 divisors (see below), whose sum is σ = 35903795840. Its totient is φ = 26438248368.

The previous prime is 31130222203. The next prime is 31130222237. The reversal of 31130222221 is 12222203113.

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

It is not a de Polignac number, because 31130222221 - 2¹⁷ = 31130091149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31130222621) 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, 20399121 + ... + 20400646.

It is an arithmetic number, because the mean of its divisors is an integer number (4487974480).

Almost surely, 2^31130222221 is an apocalyptic number.

It is an amenable number.

31130222221 is a deficient number, since it is larger than the sum of its proper divisors (4773573619).

31130222221 is a wasteful number, since it uses less digits than its factorization.

31130222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40799883.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 31130222221 its reverse (12222203113), we get a palindrome (43352425334).

The spelling of 31130222221 in words is "thirty-one billion, one hundred thirty million, two hundred twenty-two thousand, two hundred twenty-one".