201112111000021 has 4 divisors (see below), whose sum is σ = 216582273384652. Its totient is φ = 185641948615392.

The previous prime is 201112110999977. The next prime is 201112111000063. The reversal of 201112111000021 is 120000111211102.

It is a happy number.

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 23018788884100 + 178093322115921 = 4797790^2 + 13345161^2 .

It is a cyclic number.

It is not a de Polignac number, because 201112111000021 - 2¹⁹ = 201112110475733 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 15470162384617 = 201112111000021 / (2 + 0 + 1 + 1 + 1 + 2 + 1 + 1 + 1 + 0 + 0 + 0 + 0 + 2 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201112110999965 and 201112111000010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201112111000091) 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, 7735081192296 + ... + 7735081192321.

It is an arithmetic number, because the mean of its divisors is an integer number (54145568346163).

Almost surely, 2^{201112111000021} is an apocalyptic number.

It is an amenable number.

201112111000021 is a deficient number, since it is larger than the sum of its proper divisors (15470162384631).

201112111000021 is a wasteful number, since it uses less digits than its factorization.

201112111000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15470162384630.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 201112111000021 its reverse (120000111211102), we get a palindrome (321112222211123).

The spelling of 201112111000021 in words is "two hundred one trillion, one hundred twelve billion, one hundred eleven million, twenty-one", and thus it is an aban number.