221265305 has 8 divisors (see below), whose sum is σ = 265636800. Its totient is φ = 176933296.

The previous prime is 221265277. The next prime is 221265347. The reversal of 221265305 is 503562122.

221265305 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 221265305 - 2¹⁴ = 221248921 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4316 + ... + 21474.

It is an arithmetic number, because the mean of its divisors is an integer number (33204600).

Almost surely, 2^221265305 is an apocalyptic number.

It is an amenable number.

221265305 is a deficient number, since it is larger than the sum of its proper divisors (44371495).

221265305 is a wasteful number, since it uses less digits than its factorization.

221265305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19743.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 221265305 is about 14874.9892436936. The cubic root of 221265305 is about 604.8361963481.

The spelling of 221265305 in words is "two hundred twenty-one million, two hundred sixty-five thousand, three hundred five".