221021221201111 has 2 divisors, whose sum is σ = 221021221201112. Its totient is φ = 221021221201110.

The previous prime is 221021221201061. The next prime is 221021221201147. The reversal of 221021221201111 is 111102122120122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221021221201111 - 2²⁷ = 221021086983383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221021221201411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510610600555 + 110510610600556.

It is an arithmetic number, because the mean of its divisors is an integer number (110510610600556).

Almost surely, 2^{221021221201111} is an apocalyptic number.

221021221201111 is a deficient number, since it is larger than the sum of its proper divisors (1).

221021221201111 is an equidigital number, since it uses as much as digits as its factorization.

221021221201111 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 221021221201111 its reverse (111102122120122), we get a palindrome (332123343321233).

The spelling of 221021221201111 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred twenty-one million, two hundred one thousand, one hundred eleven".