2001233031221 has 16 divisors (see below), whose sum is σ = 2042212435200. Its totient is φ = 1960499481600.

The previous prime is 2001233031209. The next prime is 2001233031257. The reversal of 2001233031221 is 1221303321002.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001233031221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2001233031193 and 2001233031202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001233031821) 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, 22358285 + ... + 22447613.

It is an arithmetic number, because the mean of its divisors is an integer number (127638277200).

Almost surely, 2^{2001233031221} is an apocalyptic number.

It is an amenable number.

2001233031221 is a deficient number, since it is larger than the sum of its proper divisors (40979403979).

2001233031221 is an equidigital number, since it uses as much as digits as its factorization.

2001233031221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90700.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 2001233031221 its reverse (1221303321002), we get a palindrome (3222536352223).

The spelling of 2001233031221 in words is "two trillion, one billion, two hundred thirty-three million, thirty-one thousand, two hundred twenty-one".