20011110221 has 4 divisors (see below), whose sum is σ = 20021605632. Its totient is φ = 20000614812.

The previous prime is 20011110211. The next prime is 20011110253. The reversal of 20011110221 is 12201111002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20011110221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011110211) 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, 5244845 + ... + 5248658.

It is an arithmetic number, because the mean of its divisors is an integer number (5005401408).

Almost surely, 2^20011110221 is an apocalyptic number.

It is an amenable number.

20011110221 is a deficient number, since it is larger than the sum of its proper divisors (10495411).

20011110221 is a wasteful number, since it uses less digits than its factorization.

20011110221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10495410.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20011110221 its reverse (12201111002), we get a palindrome (32212221223).

The spelling of 20011110221 in words is "twenty billion, eleven million, one hundred ten thousand, two hundred twenty-one".