111222021020021 has 2 divisors, whose sum is σ = 111222021020022. Its totient is φ = 111222021020020.

The previous prime is 111222021019999. The next prime is 111222021020051. The reversal of 111222021020021 is 120020120222111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110705223939025 + 516797080996 = 10521655^2 + 718886^2 .

It is a cyclic number.

It is not a de Polignac number, because 111222021020021 - 2¹⁴ = 111222021003637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111222021020051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55611010510010 + 55611010510011.

It is an arithmetic number, because the mean of its divisors is an integer number (55611010510011).

Almost surely, 2^{111222021020021} is an apocalyptic number.

It is an amenable number.

111222021020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111222021020021 is an equidigital number, since it uses as much as digits as its factorization.

111222021020021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 111222021020021 its reverse (120020120222111), we get a palindrome (231242141242132).

The spelling of 111222021020021 in words is "one hundred eleven trillion, two hundred twenty-two billion, twenty-one million, twenty thousand, twenty-one".