20201221000111 has 4 divisors (see below), whose sum is σ = 20201235535224. Its totient is φ = 20201206465000.

The previous prime is 20201221000109. The next prime is 20201221000127. The reversal of 20201221000111 is 11100012210202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20201221000111 - 2¹ = 20201221000109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20201221000091 and 20201221000100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201221000141) 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, 4932805 + ... + 8045806.

It is an arithmetic number, because the mean of its divisors is an integer number (5050308883806).

Almost surely, 2^{20201221000111} is an apocalyptic number.

20201221000111 is a deficient number, since it is larger than the sum of its proper divisors (14535113).

20201221000111 is a wasteful number, since it uses less digits than its factorization.

20201221000111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14535112.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20201221000111 its reverse (11100012210202), we get a palindrome (31301233210313).

The spelling of 20201221000111 in words is "twenty trillion, two hundred one billion, two hundred twenty-one million, one hundred eleven", and thus it is an aban number.