31330220212 has 6 divisors (see below), whose sum is σ = 54827885378. Its totient is φ = 15665110104.

The previous prime is 31330220191. The next prime is 31330220213. The reversal of 31330220212 is 21202203313.

It can be written as a sum of positive squares in only one way, i.e., 23066319376 + 8263900836 = 151876^2 + 90906^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31330220212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31330220213) 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 as a sum of consecutive naturals, namely, 3916277523 + ... + 3916277530.

Almost surely, 2^31330220212 is an apocalyptic number.

It is an amenable number.

31330220212 is a deficient number, since it is larger than the sum of its proper divisors (23497665166).

31330220212 is a wasteful number, since it uses less digits than its factorization.

31330220212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7832555057 (or 7832555055 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 31330220212 its reverse (21202203313), we get a palindrome (52532423525).

The spelling of 31330220212 in words is "thirty-one billion, three hundred thirty million, two hundred twenty thousand, two hundred twelve".