31330220121 has 12 divisors (see below), whose sum is σ = 46930865072. Its totient is φ = 20886813252.

The previous prime is 31330220087. The next prime is 31330220143. The reversal of 31330220121 is 12102203313.

It is not a de Polignac number, because 31330220121 - 2¹³ = 31330211929 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31330220094 and 31330220103.

It is not an unprimeable number, because it can be changed into a prime (31330220191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64465231 + ... + 64465716.

Almost surely, 2^31330220121 is an apocalyptic number.

It is an amenable number.

31330220121 is a deficient number, since it is larger than the sum of its proper divisors (15600644951).

31330220121 is an equidigital number, since it uses as much as digits as its factorization.

31330220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128930962 (or 128930950 counting only the distinct ones).

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

Adding to 31330220121 its reverse (12102203313), we get a palindrome (43432423434).

The spelling of 31330220121 in words is "thirty-one billion, three hundred thirty million, two hundred twenty thousand, one hundred twenty-one".