221352445 has 4 divisors (see below), whose sum is σ = 265622940. Its totient is φ = 177081952.

The previous prime is 221352421. The next prime is 221352487. The reversal of 221352445 is 544253122.

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 44009956 + 177342489 = 6634^2 + 13317^2 .

It is a cyclic number.

It is not a de Polignac number, because 221352445 - 2¹⁷ = 221221373 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22135240 + ... + 22135249.

It is an arithmetic number, because the mean of its divisors is an integer number (66405735).

Almost surely, 2^221352445 is an apocalyptic number.

It is an amenable number.

221352445 is a deficient number, since it is larger than the sum of its proper divisors (44270495).

221352445 is an equidigital number, since it uses as much as digits as its factorization.

221352445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44270494.

The product of its digits is 9600, while the sum is 28.

The square root of 221352445 is about 14877.9180331120. The cubic root of 221352445 is about 604.9155859731.

The spelling of 221352445 in words is "two hundred twenty-one million, three hundred fifty-two thousand, four hundred forty-five".