221604513 has 8 divisors (see below), whose sum is σ = 318201408. Its totient is φ = 136371984.

The previous prime is 221604479. The next prime is 221604547. The reversal of 221604513 is 315406122.

221604513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221604479) and next prime (221604547).

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

It is not a de Polignac number, because 221604513 - 2¹³ = 221596321 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221604553) 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, 2841045 + ... + 2841122.

It is an arithmetic number, because the mean of its divisors is an integer number (39775176).

Almost surely, 2^221604513 is an apocalyptic number.

It is an amenable number.

221604513 is a deficient number, since it is larger than the sum of its proper divisors (96596895).

221604513 is a wasteful number, since it uses less digits than its factorization.

221604513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5682183.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 221604513 is about 14886.3868349576. The cubic root of 221604513 is about 605.1451173870.

The spelling of 221604513 in words is "two hundred twenty-one million, six hundred four thousand, five hundred thirteen".