20021221101111 has 8 divisors (see below), whose sum is σ = 26720361055104. Its totient is φ = 13334780940600.

The previous prime is 20021221101071. The next prime is 20021221101169. The reversal of 20021221101111 is 11110112212002.

It is a happy number.

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

It is not a de Polignac number, because 20021221101111 - 2⁹ = 20021221100599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021221102111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3174944691 + ... + 3174950996.

It is an arithmetic number, because the mean of its divisors is an integer number (3340045131888).

Almost surely, 2^{20021221101111} is an apocalyptic number.

20021221101111 is a deficient number, since it is larger than the sum of its proper divisors (6699139953993).

20021221101111 is a wasteful number, since it uses less digits than its factorization.

20021221101111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6349896741.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20021221101111 its reverse (11110112212002), we get a palindrome (31131333313113).

The spelling of 20021221101111 in words is "twenty trillion, twenty-one billion, two hundred twenty-one million, one hundred one thousand, one hundred eleven".