201201111111001 has 4 divisors (see below), whose sum is σ = 201665778804532. Its totient is φ = 200736443417472.

The previous prime is 201201111110977. The next prime is 201201111111061. The reversal of 201201111111001 is 100111111102102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46677590410000 + 154523520701001 = 6832100^2 + 12430749^2 .

It is a cyclic number.

It is not a de Polignac number, because 201201111111001 - 2¹¹ = 201201111108953 is a prime.

It is a super-2 number, since 2×201201111111001² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201201111111061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232333846116 + ... + 232333846981.

It is an arithmetic number, because the mean of its divisors is an integer number (50416444701133).

Almost surely, 2^{201201111111001} is an apocalyptic number.

It is an amenable number.

201201111111001 is a deficient number, since it is larger than the sum of its proper divisors (464667693531).

201201111111001 is an equidigital number, since it uses as much as digits as its factorization.

201201111111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464667693530.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 201201111111001 its reverse (100111111102102), we get a palindrome (301312222213103).

It can be divided in two parts, 20 and 1201111111001, that added together give a palindrome (1201111111021).

The spelling of 201201111111001 in words is "two hundred one trillion, two hundred one billion, one hundred eleven million, one hundred eleven thousand, one".