221269123 has 2 divisors, whose sum is σ = 221269124. Its totient is φ = 221269122.

The previous prime is 221269073. The next prime is 221269129. The reversal of 221269123 is 321962122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221269123 - 2²¹ = 219171971 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221269091 and 221269100.

It is not a weakly prime, because it can be changed into another prime (221269129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110634561 + 110634562.

It is an arithmetic number, because the mean of its divisors is an integer number (110634562).

Almost surely, 2^221269123 is an apocalyptic number.

221269123 is a deficient number, since it is larger than the sum of its proper divisors (1).

221269123 is an equidigital number, since it uses as much as digits as its factorization.

221269123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 28.

The square root of 221269123 is about 14875.1175793672. The cubic root of 221269123 is about 604.8396752055.

The spelling of 221269123 in words is "two hundred twenty-one million, two hundred sixty-nine thousand, one hundred twenty-three".