221223127 has 2 divisors, whose sum is σ = 221223128. Its totient is φ = 221223126.

The previous prime is 221223109. The next prime is 221223143. The reversal of 221223127 is 721322122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221223127 - 2¹⁹ = 220698839 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 221223098 and 221223107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221223157) 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, 110611563 + 110611564.

It is an arithmetic number, because the mean of its divisors is an integer number (110611564).

Almost surely, 2^221223127 is an apocalyptic number.

221223127 is a deficient number, since it is larger than the sum of its proper divisors (1).

221223127 is an equidigital number, since it uses as much as digits as its factorization.

221223127 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 22.

The square root of 221223127 is about 14873.5714271993. The cubic root of 221223127 is about 604.7977622426.

Adding to 221223127 its reverse (721322122), we get a palindrome (942545249).

The spelling of 221223127 in words is "two hundred twenty-one million, two hundred twenty-three thousand, one hundred twenty-seven".