20000111122221 has 8 divisors (see below), whose sum is σ = 26666884281600. Its totient is φ = 13333372688832.

The previous prime is 20000111122141. The next prime is 20000111122231. The reversal of 20000111122221 is 12222111100002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20000111122221 - 2⁹ = 20000111121709 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20000111122221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000111122231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7306525 + ... + 9663618.

It is an arithmetic number, because the mean of its divisors is an integer number (3333360535200).

Almost surely, 2^{20000111122221} is an apocalyptic number.

It is an amenable number.

20000111122221 is a deficient number, since it is larger than the sum of its proper divisors (6666773159379).

20000111122221 is a wasteful number, since it uses less digits than its factorization.

20000111122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17362995.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20000111122221 its reverse (12222111100002), we get a palindrome (32222222222223).

The spelling of 20000111122221 in words is "twenty trillion, one hundred eleven million, one hundred twenty-two thousand, two hundred twenty-one".