201231222001 has 4 divisors (see below), whose sum is σ = 201232225600. Its totient is φ = 201230218404.

The previous prime is 201231221969. The next prime is 201231222043. The reversal of 201231222001 is 100222132102.

It is a happy number.

201231222001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 201231222001 - 2⁵ = 201231221969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201231228001) 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 3 ways as a sum of consecutive naturals, for example, 86421 + ... + 640258.

It is an arithmetic number, because the mean of its divisors is an integer number (50308056400).

Almost surely, 2^201231222001 is an apocalyptic number.

It is an amenable number.

201231222001 is a deficient number, since it is larger than the sum of its proper divisors (1003599).

201231222001 is an equidigital number, since it uses as much as digits as its factorization.

201231222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1003598.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 201231222001 its reverse (100222132102), we get a palindrome (301453354103).

The spelling of 201231222001 in words is "two hundred one billion, two hundred thirty-one million, two hundred twenty-two thousand, one".