221242127 has 2 divisors, whose sum is σ = 221242128. Its totient is φ = 221242126.

The previous prime is 221242103. The next prime is 221242139. The reversal of 221242127 is 721242122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221242127 - 2²⁰ = 220193551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221242157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110621063 + 110621064.

It is an arithmetic number, because the mean of its divisors is an integer number (110621064).

Almost surely, 2^221242127 is an apocalyptic number.

221242127 is a deficient number, since it is larger than the sum of its proper divisors (1).

221242127 is an equidigital number, since it uses as much as digits as its factorization.

221242127 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 896, while the sum is 23.

The square root of 221242127 is about 14874.2101302893. The cubic root of 221242127 is about 604.8150763283.

Adding to 221242127 its reverse (721242122), we get a palindrome (942484249).

The spelling of 221242127 in words is "two hundred twenty-one million, two hundred forty-two thousand, one hundred twenty-seven".