221220121127 has 2 divisors, whose sum is σ = 221220121128. Its totient is φ = 221220121126.

The previous prime is 221220121061. The next prime is 221220121139. The reversal of 221220121127 is 721121022122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221220121127 - 2²⁶ = 221153012263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221220121027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610060563 + 110610060564.

It is an arithmetic number, because the mean of its divisors is an integer number (110610060564).

Almost surely, 2^221220121127 is an apocalyptic number.

221220121127 is a deficient number, since it is larger than the sum of its proper divisors (1).

221220121127 is an equidigital number, since it uses as much as digits as its factorization.

221220121127 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 23.

Adding to 221220121127 its reverse (721121022122), we get a palindrome (942341143249).

The spelling of 221220121127 in words is "two hundred twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, one hundred twenty-seven".