201231321001 has 16 divisors (see below), whose sum is σ = 210887328960. Its totient is φ = 191761093440.

The previous prime is 201231320977. The next prime is 201231321013. The reversal of 201231321001 is 100123132102.

It is a cyclic number.

It is not a de Polignac number, because 201231321001 - 2¹³ = 201231312809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201231321101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2416606 + ... + 2498488.

It is an arithmetic number, because the mean of its divisors is an integer number (13180458060).

Almost surely, 2^201231321001 is an apocalyptic number.

It is an amenable number.

201231321001 is a deficient number, since it is larger than the sum of its proper divisors (9656007959).

201231321001 is a wasteful number, since it uses less digits than its factorization.

201231321001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83016.

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

Adding to 201231321001 its reverse (100123132102), we get a palindrome (301354453103).

The spelling of 201231321001 in words is "two hundred one billion, two hundred thirty-one million, three hundred twenty-one thousand, one".