2001321223231 has 16 divisors (see below), whose sum is σ = 2195894880000. Its totient is φ = 1808867332800.

The previous prime is 2001321223189. The next prime is 2001321223249. The reversal of 2001321223231 is 1323221231002.

It is a de Polignac number, because none of the positive numbers 2^k-2001321223231 is a prime.

It is a super-2 number, since 2×2001321223231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001321223261) 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, 2545620 + ... + 3237718.

It is an arithmetic number, because the mean of its divisors is an integer number (137243430000).

Almost surely, 2^{2001321223231} is an apocalyptic number.

2001321223231 is a deficient number, since it is larger than the sum of its proper divisors (194573656769).

2001321223231 is a wasteful number, since it uses less digits than its factorization.

2001321223231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693630.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 2001321223231 its reverse (1323221231002), we get a palindrome (3324542454233).

The spelling of 2001321223231 in words is "two trillion, one billion, three hundred twenty-one million, two hundred twenty-three thousand, two hundred thirty-one".