221540513 has 8 divisors (see below), whose sum is σ = 234552000. Its totient is φ = 208664208.

The previous prime is 221540479. The next prime is 221540533. The reversal of 221540513 is 315045122.

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 221540513 - 2¹⁴ = 221524129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221540533) 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, 30413 + ... + 36986.

It is an arithmetic number, because the mean of its divisors is an integer number (29319000).

Almost surely, 2^221540513 is an apocalyptic number.

It is an amenable number.

221540513 is a deficient number, since it is larger than the sum of its proper divisors (13011487).

221540513 is a wasteful number, since it uses less digits than its factorization.

221540513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67591.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 221540513 is about 14884.2370647608. The cubic root of 221540513 is about 605.0868559134.

Adding to 221540513 its reverse (315045122), we get a palindrome (536585635).

The spelling of 221540513 in words is "two hundred twenty-one million, five hundred forty thousand, five hundred thirteen".