221099047 has 4 divisors (see below), whose sum is σ = 238106680. Its totient is φ = 204091416.

The previous prime is 221099033. The next prime is 221099071. The reversal of 221099047 is 740990122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 740990122 = 2 ⋅370495061.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221099047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221099147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8503797 + ... + 8503822.

It is an arithmetic number, because the mean of its divisors is an integer number (59526670).

Almost surely, 2^221099047 is an apocalyptic number.

221099047 is a deficient number, since it is larger than the sum of its proper divisors (17007633).

221099047 is a wasteful number, since it uses less digits than its factorization.

221099047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17007632.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 221099047 is about 14869.3996852597. The cubic root of 221099047 is about 604.6846677667.

The spelling of 221099047 in words is "two hundred twenty-one million, ninety-nine thousand, forty-seven".