2001012201 has 16 divisors (see below), whose sum is σ = 2971945600. Its totient is φ = 1330640784.

The previous prime is 2001012179. The next prime is 2001012229. The reversal of 2001012201 is 1022101002.

It is not a de Polignac number, because 2001012201 - 2¹¹ = 2001010153 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 (2001012001) 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, 82621 + ... + 104058.

It is an arithmetic number, because the mean of its divisors is an integer number (185746600).

Almost surely, 2^2001012201 is an apocalyptic number.

It is an amenable number.

2001012201 is a deficient number, since it is larger than the sum of its proper divisors (970933399).

2001012201 is a wasteful number, since it uses less digits than its factorization.

2001012201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187085 (or 187079 counting only the distinct ones).

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

The square root of 2001012201 is about 44732.6748697191. The cubic root of 2001012201 is about 1260.1335629390.

Adding to 2001012201 its reverse (1022101002), we get a palindrome (3023113203).

The spelling of 2001012201 in words is "two billion, one million, twelve thousand, two hundred one".