2001123201 has 48 divisors (see below), whose sum is σ = 3419748288. Its totient is φ = 1029168000.

The previous prime is 2001123197. The next prime is 2001123209. The reversal of 2001123201 is 1023211002.

It is not a de Polignac number, because 2001123201 - 2² = 2001123197 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2001123209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 157191 + ... + 169443.

It is an arithmetic number, because the mean of its divisors is an integer number (71244756).

Almost surely, 2^2001123201 is an apocalyptic number.

2001123201 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2001123201 is a deficient number, since it is larger than the sum of its proper divisors (1418625087).

2001123201 is a wasteful number, since it uses less digits than its factorization.

2001123201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12382 (or 12375 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 2001123201 is about 44733.9155563204. The cubic root of 2001123201 is about 1260.1568631866.

Adding to 2001123201 its reverse (1023211002), we get a palindrome (3024334203).

The spelling of 2001123201 in words is "two billion, one million, one hundred twenty-three thousand, two hundred one".