221365247 has 8 divisors (see below), whose sum is σ = 227910144. Its totient is φ = 214883928.

The previous prime is 221365223. The next prime is 221365297. The reversal of 221365247 is 742563122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221365247 - 2¹⁴ = 221348863 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 (221365217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8783 + ... + 22800.

It is an arithmetic number, because the mean of its divisors is an integer number (28488768).

Almost surely, 2^221365247 is an apocalyptic number.

221365247 is a deficient number, since it is larger than the sum of its proper divisors (6544897).

221365247 is a wasteful number, since it uses less digits than its factorization.

221365247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31789.

The product of its digits is 20160, while the sum is 32.

The square root of 221365247 is about 14878.3482618199. The cubic root of 221365247 is about 604.9272475867.

The spelling of 221365247 in words is "two hundred twenty-one million, three hundred sixty-five thousand, two hundred forty-seven".