201231210001 has 2 divisors, whose sum is σ = 201231210002. Its totient is φ = 201231210000.

The previous prime is 201231209981. The next prime is 201231210031. The reversal of 201231210001 is 100012132102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111423107601 + 89808102400 = 333801^2 + 299680^2 .

It is a cyclic number.

It is not a de Polignac number, because 201231210001 - 2¹⁵ = 201231177233 is a prime.

It is not a weakly prime, because it can be changed into another prime (201231210031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100615605000 + 100615605001.

It is an arithmetic number, because the mean of its divisors is an integer number (100615605001).

Almost surely, 2^201231210001 is an apocalyptic number.

It is an amenable number.

201231210001 is a deficient number, since it is larger than the sum of its proper divisors (1).

201231210001 is an equidigital number, since it uses as much as digits as its factorization.

201231210001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 201231210001 its reverse (100012132102), we get a palindrome (301243342103).

The spelling of 201231210001 in words is "two hundred one billion, two hundred thirty-one million, two hundred ten thousand, one".