201111200021 has 4 divisors (see below), whose sum is σ = 201997152672. Its totient is φ = 200225247372.

The previous prime is 201111199997. The next prime is 201111200027. The reversal of 201111200021 is 120002111102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201111200021 - 2⁶ = 201111199957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201111199975 and 201111200011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201111200027) 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, 442975985 + ... + 442976438.

It is an arithmetic number, because the mean of its divisors is an integer number (50499288168).

Almost surely, 2^201111200021 is an apocalyptic number.

It is an amenable number.

201111200021 is a deficient number, since it is larger than the sum of its proper divisors (885952651).

201111200021 is an equidigital number, since it uses as much as digits as its factorization.

201111200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885952650.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 201111200021 its reverse (120002111102), we get a palindrome (321113311123).

The spelling of 201111200021 in words is "two hundred one billion, one hundred eleven million, two hundred thousand, twenty-one".