31130221201 has 2 divisors, whose sum is σ = 31130221202. Its totient is φ = 31130221200.

The previous prime is 31130221193. The next prime is 31130221223. The reversal of 31130221201 is 10212203113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18312584976 + 12817636225 = 135324^2 + 113215^2 .

It is a cyclic number.

It is not a de Polignac number, because 31130221201 - 2³ = 31130221193 is a prime.

It is not a weakly prime, because it can be changed into another prime (31130221261) 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, 15565110600 + 15565110601.

It is an arithmetic number, because the mean of its divisors is an integer number (15565110601).

Almost surely, 2^31130221201 is an apocalyptic number.

It is an amenable number.

31130221201 is a deficient number, since it is larger than the sum of its proper divisors (1).

31130221201 is an equidigital number, since it uses as much as digits as its factorization.

31130221201 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 31130221201 its reverse (10212203113), we get a palindrome (41342424314).

The spelling of 31130221201 in words is "thirty-one billion, one hundred thirty million, two hundred twenty-one thousand, two hundred one".