111021210221 has 2 divisors, whose sum is σ = 111021210222. Its totient is φ = 111021210220.

The previous prime is 111021210211. The next prime is 111021210227. The reversal of 111021210221 is 122012120111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102951781321 + 8069428900 = 320861^2 + 89830^2 .

It is a cyclic number.

It is not a de Polignac number, because 111021210221 - 2³⁴ = 93841341037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111021210196 and 111021210205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111021210227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55510605110 + 55510605111.

It is an arithmetic number, because the mean of its divisors is an integer number (55510605111).

Almost surely, 2^111021210221 is an apocalyptic number.

It is an amenable number.

111021210221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111021210221 is an equidigital number, since it uses as much as digits as its factorization.

111021210221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 111021210221 its reverse (122012120111), we get a palindrome (233033330332).

The spelling of 111021210221 in words is "one hundred eleven billion, twenty-one million, two hundred ten thousand, two hundred twenty-one".