221430245 has 16 divisors (see below), whose sum is σ = 270872640. Its totient is φ = 173721600.

The previous prime is 221430239. The next prime is 221430247. The reversal of 221430245 is 542034122.

It is a happy number.

221430245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-221430245 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221430245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221430247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 188510 + ... + 189680.

It is an arithmetic number, because the mean of its divisors is an integer number (16929540).

Almost surely, 2^221430245 is an apocalyptic number.

It is an amenable number.

221430245 is a deficient number, since it is larger than the sum of its proper divisors (49442395).

221430245 is a wasteful number, since it uses less digits than its factorization.

221430245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1876.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 221430245 is about 14880.5324165502. The cubic root of 221430245 is about 604.9864487095.

Adding to 221430245 its reverse (542034122), we get a palindrome (763464367).

The spelling of 221430245 in words is "two hundred twenty-one million, four hundred thirty thousand, two hundred forty-five".