221220212222111 has 2 divisors, whose sum is σ = 221220212222112. Its totient is φ = 221220212222110.

The previous prime is 221220212222081. The next prime is 221220212222129. The reversal of 221220212222111 is 111222212022122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221220212222111 - 2²² = 221220208027807 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221220212222311) 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, 110610106111055 + 110610106111056.

It is an arithmetic number, because the mean of its divisors is an integer number (110610106111056).

Almost surely, 2^{221220212222111} is an apocalyptic number.

221220212222111 is a deficient number, since it is larger than the sum of its proper divisors (1).

221220212222111 is an equidigital number, since it uses as much as digits as its factorization.

221220212222111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 221220212222111 its reverse (111222212022122), we get a palindrome (332442424244233).

The spelling of 221220212222111 in words is "two hundred twenty-one trillion, two hundred twenty billion, two hundred twelve million, two hundred twenty-two thousand, one hundred eleven".