221152345 has 4 divisors (see below), whose sum is σ = 265382820. Its totient is φ = 176921872.

The previous prime is 221152333. The next prime is 221152361. The reversal of 221152345 is 543251122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 113656921 + 107495424 = 10661^2 + 10368^2 .

It is a cyclic number.

It is not a de Polignac number, because 221152345 - 2⁵ = 221152313 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22115230 + ... + 22115239.

It is an arithmetic number, because the mean of its divisors is an integer number (66345705).

Almost surely, 2^221152345 is an apocalyptic number.

It is an amenable number.

221152345 is a deficient number, since it is larger than the sum of its proper divisors (44230475).

221152345 is an equidigital number, since it uses as much as digits as its factorization.

221152345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44230474.

The product of its digits is 2400, while the sum is 25.

The square root of 221152345 is about 14871.1917814276. The cubic root of 221152345 is about 604.7332521674.

The spelling of 221152345 in words is "two hundred twenty-one million, one hundred fifty-two thousand, three hundred forty-five".