20011112001 has 6 divisors (see below), whose sum is σ = 28904939570. Its totient is φ = 13340741328.

The previous prime is 20011111987. The next prime is 20011112041. The reversal of 20011112001 is 10021111002.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18618329601 + 1392782400 = 136449^2 + 37320^2 .

It is not a de Polignac number, because 20011112001 - 2⁷ = 20011111873 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2223456889 = 20011112001 / (2 + 0 + 0 + 1 + 1 + 1 + 1 + 2 + 0 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20011112041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1111728436 + ... + 1111728453.

Almost surely, 2^20011112001 is an apocalyptic number.

It is an amenable number.

20011112001 is a deficient number, since it is larger than the sum of its proper divisors (8893827569).

20011112001 is a wasteful number, since it uses less digits than its factorization.

20011112001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2223456895 (or 2223456892 counting only the distinct ones).

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

Adding to 20011112001 its reverse (10021111002), we get a palindrome (30032223003).

Subtracting from 20011112001 its reverse (10021111002), we obtain a palindrome (9990000999).

The spelling of 20011112001 in words is "twenty billion, eleven million, one hundred twelve thousand, one".