221012111 has 2 divisors, whose sum is σ = 221012112. Its totient is φ = 221012110.

The previous prime is 221012081. The next prime is 221012119. The reversal of 221012111 is 111210122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221012111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221012092 and 221012101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221012119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110506055 + 110506056.

It is an arithmetic number, because the mean of its divisors is an integer number (110506056).

Almost surely, 2^221012111 is an apocalyptic number.

221012111 is a deficient number, since it is larger than the sum of its proper divisors (1).

221012111 is an equidigital number, since it uses as much as digits as its factorization.

221012111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 221012111 is about 14866.4760787485. The cubic root of 221012111 is about 604.6054035055.

Adding to 221012111 its reverse (111210122), we get a palindrome (332222233).

The spelling of 221012111 in words is "two hundred twenty-one million, twelve thousand, one hundred eleven".