20021221102111 has 2 divisors, whose sum is σ = 20021221102112. Its totient is φ = 20021221102110.

The previous prime is 20021221102079. The next prime is 20021221102163. The reversal of 20021221102111 is 11120112212002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20021221102111 - 2⁵ = 20021221102079 is a prime.

It is a super-2 number, since 2×20021221102111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021221102711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010610551055 + 10010610551056.

It is an arithmetic number, because the mean of its divisors is an integer number (10010610551056).

Almost surely, 2^{20021221102111} is an apocalyptic number.

20021221102111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021221102111 is an equidigital number, since it uses as much as digits as its factorization.

20021221102111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20021221102111 its reverse (11120112212002), we get a palindrome (31141333314113).

The spelling of 20021221102111 in words is "twenty trillion, twenty-one billion, two hundred twenty-one million, one hundred two thousand, one hundred eleven".