2001121303 has 4 divisors (see below), whose sum is σ = 2043698400. Its totient is φ = 1958544208.

The previous prime is 2001121261. The next prime is 2001121313. The reversal of 2001121303 is 3031211002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2001121303 - 2¹³ = 2001113111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001121313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21288478 + ... + 21288571.

It is an arithmetic number, because the mean of its divisors is an integer number (510924600).

Almost surely, 2^2001121303 is an apocalyptic number.

2001121303 is a deficient number, since it is larger than the sum of its proper divisors (42577097).

2001121303 is an equidigital number, since it uses as much as digits as its factorization.

2001121303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42577096.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 2001121303 is about 44733.8943419864. The cubic root of 2001121303 is about 1260.1564647806.

Adding to 2001121303 its reverse (3031211002), we get a palindrome (5032332305).

It can be divided in two parts, 20011 and 21303, that added together give a palindrome (41314).

The spelling of 2001121303 in words is "two billion, one million, one hundred twenty-one thousand, three hundred three".