20111111019 has 6 divisors (see below), whose sum is σ = 29049382596. Its totient is φ = 13407407340.

The previous prime is 20111111003. The next prime is 20111111021. The reversal of 20111111019 is 91011111102.

It is not a de Polignac number, because 20111111019 - 2⁴ = 20111111003 is a prime.

It is a super-2 number, since 2×20111111019² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20111110992 and 20111111010.

It is not an unprimeable number, because it can be changed into a prime (20111111039) 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, 1117283937 + ... + 1117283954.

It is an arithmetic number, because the mean of its divisors is an integer number (4841563766).

Almost surely, 2^20111111019 is an apocalyptic number.

20111111019 is a deficient number, since it is larger than the sum of its proper divisors (8938271577).

20111111019 is a wasteful number, since it uses less digits than its factorization.

20111111019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2234567897 (or 2234567894 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 18.

The spelling of 20111111019 in words is "twenty billion, one hundred eleven million, one hundred eleven thousand, nineteen".