20021110011 has 16 divisors (see below), whose sum is σ = 33898176000. Its totient is φ = 11440634184.

The previous prime is 20021109991. The next prime is 20021110033. The reversal of 20021110011 is 11001112002.

It is a happy number.

It is not a de Polignac number, because 20021110011 - 2¹¹ = 20021107963 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20021109975 and 20021110002.

It is not an unprimeable number, because it can be changed into a prime (20021110061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52965711 + ... + 52966088.

It is an arithmetic number, because the mean of its divisors is an integer number (2118636000).

Almost surely, 2^20021110011 is an apocalyptic number.

20021110011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20021110011 is a deficient number, since it is larger than the sum of its proper divisors (13877065989).

20021110011 is a wasteful number, since it uses less digits than its factorization.

20021110011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105931815 (or 105931809 counting only the distinct ones).

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

Adding to 20021110011 its reverse (11001112002), we get a palindrome (31022222013).

The spelling of 20021110011 in words is "twenty billion, twenty-one million, one hundred ten thousand, eleven".