222111202021 has 2 divisors, whose sum is σ = 222111202022. Its totient is φ = 222111202020.

The previous prime is 222111201979. The next prime is 222111202051. The reversal of 222111202021 is 120202111222.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208255322500 + 13855879521 = 456350^2 + 117711^2 .

It is a cyclic number.

It is not a de Polignac number, because 222111202021 - 2²⁷ = 221976984293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222111201986 and 222111202004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222111202051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111055601010 + 111055601011.

It is an arithmetic number, because the mean of its divisors is an integer number (111055601011).

Almost surely, 2^222111202021 is an apocalyptic number.

It is an amenable number.

222111202021 is a deficient number, since it is larger than the sum of its proper divisors (1).

222111202021 is an equidigital number, since it uses as much as digits as its factorization.

222111202021 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 16.

Adding to 222111202021 its reverse (120202111222), we get a palindrome (342313313243).

The spelling of 222111202021 in words is "two hundred twenty-two billion, one hundred eleven million, two hundred two thousand, twenty-one".