221221010111 has 2 divisors, whose sum is σ = 221221010112. Its totient is φ = 221221010110.

The previous prime is 221221010089. The next prime is 221221010123. The reversal of 221221010111 is 111010122122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221221010111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221221010011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610505055 + 110610505056.

It is an arithmetic number, because the mean of its divisors is an integer number (110610505056).

Almost surely, 2^221221010111 is an apocalyptic number.

221221010111 is a deficient number, since it is larger than the sum of its proper divisors (1).

221221010111 is an equidigital number, since it uses as much as digits as its factorization.

221221010111 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 221221010111 its reverse (111010122122), we get a palindrome (332231132233).

The spelling of 221221010111 in words is "two hundred twenty-one billion, two hundred twenty-one million, ten thousand, one hundred eleven".