201111002001 has 144 divisors (see below), whose sum is σ = 379176819840. Its totient is φ = 100295470080.

The previous prime is 201111001991. The next prime is 201111002023. The reversal of 201111002001 is 100200111102.

It is a happy number.

It is not a de Polignac number, because 201111002001 - 2¹¹ = 201110999953 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 (201111002041) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 189548011 + ... + 189549071.

It is an arithmetic number, because the mean of its divisors is an integer number (2633172360).

Almost surely, 2^201111002001 is an apocalyptic number.

201111002001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

201111002001 is a deficient number, since it is larger than the sum of its proper divisors (178065817839).

201111002001 is a wasteful number, since it uses less digits than its factorization.

201111002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2056 (or 2040 counting only the distinct ones).

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

Adding to 201111002001 its reverse (100200111102), we get a palindrome (301311113103).

The spelling of 201111002001 in words is "two hundred one billion, one hundred eleven million, two thousand, one".