221604607 has 12 divisors (see below), whose sum is σ = 262651896. Its totient is φ = 186360720.

The previous prime is 221604601. The next prime is 221604611. The reversal of 221604607 is 706406122.

It is not a de Polignac number, because 221604607 - 2³ = 221604599 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 (221604601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40069 + ... + 45262.

It is an arithmetic number, because the mean of its divisors is an integer number (21887658).

Almost surely, 2^221604607 is an apocalyptic number.

221604607 is a deficient number, since it is larger than the sum of its proper divisors (41047289).

221604607 is an equidigital number, since it uses as much as digits as its factorization.

221604607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85398 (or 85391 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 221604607 is about 14886.3899922043. The cubic root of 221604607 is about 605.1452029503.

The spelling of 221604607 in words is "two hundred twenty-one million, six hundred four thousand, six hundred seven".