221211212122127 has 2 divisors, whose sum is σ = 221211212122128. Its totient is φ = 221211212122126.

The previous prime is 221211212122099. The next prime is 221211212122213. The reversal of 221211212122127 is 721221212112122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221211212122127 - 2⁶ = 221211212122063 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221211212122127.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221211212122427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605606061063 + 110605606061064.

It is an arithmetic number, because the mean of its divisors is an integer number (110605606061064).

Almost surely, 2^{221211212122127} is an apocalyptic number.

221211212122127 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211212122127 is an equidigital number, since it uses as much as digits as its factorization.

221211212122127 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1792, while the sum is 29.

Adding to 221211212122127 its reverse (721221212112122), we get a palindrome (942432424234249).

The spelling of 221211212122127 in words is "two hundred twenty-one trillion, two hundred eleven billion, two hundred twelve million, one hundred twenty-two thousand, one hundred twenty-seven".