221252345 has 8 divisors (see below), whose sum is σ = 265788864. Its totient is φ = 176811184.

The previous prime is 221252327. The next prime is 221252347. The reversal of 221252345 is 543252122.

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 221252345 - 2¹⁰ = 221251321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221252347) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 18629 + ... + 28098.

It is an arithmetic number, because the mean of its divisors is an integer number (33223608).

Almost surely, 2^221252345 is an apocalyptic number.

It is an amenable number.

221252345 is a deficient number, since it is larger than the sum of its proper divisors (44536519).

221252345 is an equidigital number, since it uses as much as digits as its factorization.

221252345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47679.

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

The square root of 221252345 is about 14874.5536067473. The cubic root of 221252345 is about 604.8243872514.

The spelling of 221252345 in words is "two hundred twenty-one million, two hundred fifty-two thousand, three hundred forty-five".