221365607 has 4 divisors (see below), whose sum is σ = 221455200. Its totient is φ = 221276016.

The previous prime is 221365583. The next prime is 221365609. The reversal of 221365607 is 706563122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221365607 - 2⁸ = 221365351 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 (221365609) 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, 40982 + ... + 46067.

It is an arithmetic number, because the mean of its divisors is an integer number (55363800).

Almost surely, 2^221365607 is an apocalyptic number.

221365607 is a deficient number, since it is larger than the sum of its proper divisors (89593).

221365607 is an equidigital number, since it uses as much as digits as its factorization.

221365607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89592.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 221365607 is about 14878.3603599321. The cubic root of 221365607 is about 604.9275755118.

The spelling of 221365607 in words is "two hundred twenty-one million, three hundred sixty-five thousand, six hundred seven".