221221002011 has 2 divisors, whose sum is σ = 221221002012. Its totient is φ = 221221002010.

The previous prime is 221221001927. The next prime is 221221002019. The reversal of 221221002011 is 110200122122.

221221002011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221221002011 is a prime.

It is not a weakly prime, because it can be changed into another prime (221221002019) 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, 110610501005 + 110610501006.

It is an arithmetic number, because the mean of its divisors is an integer number (110610501006).

Almost surely, 2^221221002011 is an apocalyptic number.

221221002011 is a deficient number, since it is larger than the sum of its proper divisors (1).

221221002011 is an equidigital number, since it uses as much as digits as its factorization.

221221002011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221221002011 its reverse (110200122122), we get a palindrome (331421124133).

The spelling of 221221002011 in words is "two hundred twenty-one billion, two hundred twenty-one million, two thousand, eleven".