221430345 has 16 divisors (see below), whose sum is σ = 354475392. Its totient is φ = 118033920.

The previous prime is 221430329. The next prime is 221430353. The reversal of 221430345 is 543034122.

It is not a de Polignac number, because 221430345 - 2⁴ = 221430329 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46809 + ... + 51321.

It is an arithmetic number, because the mean of its divisors is an integer number (22154712).

Almost surely, 2^221430345 is an apocalyptic number.

It is an amenable number.

221430345 is a deficient number, since it is larger than the sum of its proper divisors (133045047).

221430345 is a wasteful number, since it uses less digits than its factorization.

221430345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7792.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 221430345 is about 14880.5357766446. The cubic root of 221430345 is about 604.9865397820.

Adding to 221430345 its reverse (543034122), we get a palindrome (764464467).

The spelling of 221430345 in words is "two hundred twenty-one million, four hundred thirty thousand, three hundred forty-five".