20011002111 has 6 divisors (see below), whose sum is σ = 28904780840. Its totient is φ = 13340668068.

The previous prime is 20011002101. The next prime is 20011002173. The reversal of 20011002111 is 11120011002.

It is a happy number.

It is not a de Polignac number, because 20011002111 - 2⁵ = 20011002079 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: 2223444679 = 20011002111 / (2 + 0 + 0 + 1 + 1 + 0 + 0 + 2 + 1 + 1 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011002093 and 20011002102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011002101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1111722331 + ... + 1111722348.

Almost surely, 2^20011002111 is an apocalyptic number.

20011002111 is a deficient number, since it is larger than the sum of its proper divisors (8893778729).

20011002111 is a wasteful number, since it uses less digits than its factorization.

20011002111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2223444685 (or 2223444682 counting only the distinct ones).

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

Adding to 20011002111 its reverse (11120011002), we get a palindrome (31131013113).

It can be divided in two parts, 20011002 and 111, that multiplied together give a palindrome (2221221222).

The spelling of 20011002111 in words is "twenty billion, eleven million, two thousand, one hundred eleven".