2001200121 has 8 divisors (see below), whose sum is σ = 2964740960. Its totient is φ = 1334133396.

The previous prime is 2001200083. The next prime is 2001200141. The reversal of 2001200121 is 1210021002.

It is not a de Polignac number, because 2001200121 - 2⁶ = 2001200057 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001200141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37059235 + ... + 37059288.

It is an arithmetic number, because the mean of its divisors is an integer number (370592620).

Almost surely, 2^2001200121 is an apocalyptic number.

It is an amenable number.

2001200121 is a deficient number, since it is larger than the sum of its proper divisors (963540839).

2001200121 is an equidigital number, since it uses as much as digits as its factorization.

2001200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74118532 (or 74118526 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 2001200121 is about 44734.7752984186. The cubic root of 2001200121 is about 1260.1730091231.

Adding to 2001200121 its reverse (1210021002), we get a palindrome (3211221123).

The spelling of 2001200121 in words is "two billion, one million, two hundred thousand, one hundred twenty-one".