221123047 has 2 divisors, whose sum is σ = 221123048. Its totient is φ = 221123046.

The previous prime is 221123017. The next prime is 221123051. The reversal of 221123047 is 740321122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221123047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221123017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110561523 + 110561524.

It is an arithmetic number, because the mean of its divisors is an integer number (110561524).

Almost surely, 2^221123047 is an apocalyptic number.

221123047 is a deficient number, since it is larger than the sum of its proper divisors (1).

221123047 is an equidigital number, since it uses as much as digits as its factorization.

221123047 is an odious number, because the sum of its binary digits is odd.

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

The square root of 221123047 is about 14870.2066898883. The cubic root of 221123047 is about 604.7065462071.

Adding to 221123047 its reverse (740321122), we get a palindrome (961444169).

The spelling of 221123047 in words is "two hundred twenty-one million, one hundred twenty-three thousand, forty-seven".