31103212201 has 2 divisors, whose sum is σ = 31103212202. Its totient is φ = 31103212200.

The previous prime is 31103212183. The next prime is 31103212207. The reversal of 31103212201 is 10221230113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27241832601 + 3861379600 = 165051^2 + 62140^2 .

It is an emirp because it is prime and its reverse (10221230113) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31103212201 is a prime.

It is not a weakly prime, because it can be changed into another prime (31103212207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15551606100 + 15551606101.

It is an arithmetic number, because the mean of its divisors is an integer number (15551606101).

Almost surely, 2^31103212201 is an apocalyptic number.

It is an amenable number.

31103212201 is a deficient number, since it is larger than the sum of its proper divisors (1).

31103212201 is an equidigital number, since it uses as much as digits as its factorization.

31103212201 is an odious number, because the sum of its binary digits is odd.

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

Adding to 31103212201 its reverse (10221230113), we get a palindrome (41324442314).

The spelling of 31103212201 in words is "thirty-one billion, one hundred three million, two hundred twelve thousand, two hundred one".