221021120211211 has 2 divisors, whose sum is σ = 221021120211212. Its totient is φ = 221021120211210.

The previous prime is 221021120211197. The next prime is 221021120211217. The reversal of 221021120211211 is 112112021120122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221021120211211 - 2¹⁷ = 221021120080139 is a prime.

It is not a weakly prime, because it can be changed into another prime (221021120211217) 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 as a sum of consecutive naturals, namely, 110510560105605 + 110510560105606.

It is an arithmetic number, because the mean of its divisors is an integer number (110510560105606).

Almost surely, 2^{221021120211211} is an apocalyptic number.

221021120211211 is a deficient number, since it is larger than the sum of its proper divisors (1).

221021120211211 is an equidigital number, since it uses as much as digits as its factorization.

221021120211211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221021120211211 its reverse (112112021120122), we get a palindrome (333133141331333).

The spelling of 221021120211211 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred twenty million, two hundred eleven thousand, two hundred eleven".