221220012112111 has 2 divisors, whose sum is σ = 221220012112112. Its totient is φ = 221220012112110.

The previous prime is 221220012112049. The next prime is 221220012112147. The reversal of 221220012112111 is 111211210022122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221220012112111 - 2¹¹ = 221220012110063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221220012112811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610006056055 + 110610006056056.

It is an arithmetic number, because the mean of its divisors is an integer number (110610006056056).

Almost surely, 2^{221220012112111} is an apocalyptic number.

221220012112111 is a deficient number, since it is larger than the sum of its proper divisors (1).

221220012112111 is an equidigital number, since it uses as much as digits as its factorization.

221220012112111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221220012112111 its reverse (111211210022122), we get a palindrome (332431222134233).

The spelling of 221220012112111 in words is "two hundred twenty-one trillion, two hundred twenty billion, twelve million, one hundred twelve thousand, one hundred eleven".