221152565 has 16 divisors (see below), whose sum is σ = 272595456. Its totient is φ = 172137600.

The previous prime is 221152553. The next prime is 221152619. The reversal of 221152565 is 565251122.

221152565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221152565 - 2⁴ = 221152549 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 87104 + ... + 89606.

It is an arithmetic number, because the mean of its divisors is an integer number (17037216).

Almost surely, 2^221152565 is an apocalyptic number.

It is an amenable number.

221152565 is a deficient number, since it is larger than the sum of its proper divisors (51442891).

221152565 is a wasteful number, since it uses less digits than its factorization.

221152565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2980.

The product of its digits is 6000, while the sum is 29.

The square root of 221152565 is about 14871.1991782775. The cubic root of 221152565 is about 604.7334526947.

The spelling of 221152565 in words is "two hundred twenty-one million, one hundred fifty-two thousand, five hundred sixty-five".