221430545 has 32 divisors (see below), whose sum is σ = 324656640. Its totient is φ = 141672960.

The previous prime is 221430527. The next prime is 221430569. The reversal of 221430545 is 545034122.

It is a happy number.

It is not a de Polignac number, because 221430545 - 2¹⁰ = 221429521 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29651 + ... + 36359.

It is an arithmetic number, because the mean of its divisors is an integer number (10145520).

Almost surely, 2^221430545 is an apocalyptic number.

It is an amenable number.

221430545 is a deficient number, since it is larger than the sum of its proper divisors (103226095).

221430545 is a wasteful number, since it uses less digits than its factorization.

221430545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6785.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 221430545 is about 14880.5424968312. The cubic root of 221430545 is about 604.9867219270.

Adding to 221430545 its reverse (545034122), we get a palindrome (766464667).

The spelling of 221430545 in words is "two hundred twenty-one million, four hundred thirty thousand, five hundred forty-five".