2001111201 has 24 divisors (see below), whose sum is σ = 2942896320. Its totient is φ = 1309941600.

The previous prime is 2001111139. The next prime is 2001111209. The reversal of 2001111201 is 1021111002.

It is a happy number.

It is not a de Polignac number, because 2001111201 - 2⁹ = 2001110689 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (2001111209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 625516 + ... + 628706.

It is an arithmetic number, because the mean of its divisors is an integer number (122620680).

Almost surely, 2^2001111201 is an apocalyptic number.

It is an amenable number.

2001111201 is a deficient number, since it is larger than the sum of its proper divisors (941785119).

2001111201 is a wasteful number, since it uses less digits than its factorization.

2001111201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4437 (or 4434 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 2001111201 is about 44733.7814296981. The cubic root of 2001111201 is about 1260.1543442825.

Adding to 2001111201 its reverse (1021111002), we get a palindrome (3022222203).

The spelling of 2001111201 in words is "two billion, one million, one hundred eleven thousand, two hundred one".