221364965 has 4 divisors (see below), whose sum is σ = 265637964. Its totient is φ = 177091968.

The previous prime is 221364959. The next prime is 221364977. The reversal of 221364965 is 569463122.

221364965 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 569463122 = 2 ⋅284731561.

It can be written as a sum of positive squares in 2 ways, for example, as 147525316 + 73839649 = 12146^2 + 8593^2 .

It is a cyclic number.

It is not a de Polignac number, because 221364965 - 2¹⁰ = 221363941 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 3 ways as a sum of consecutive naturals, for example, 22136492 + ... + 22136501.

It is an arithmetic number, because the mean of its divisors is an integer number (66409491).

Almost surely, 2^221364965 is an apocalyptic number.

It is an amenable number.

221364965 is a deficient number, since it is larger than the sum of its proper divisors (44272999).

221364965 is an equidigital number, since it uses as much as digits as its factorization.

221364965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44272998.

The product of its digits is 77760, while the sum is 38.

The square root of 221364965 is about 14878.3387849585. The cubic root of 221364965 is about 604.9269907117.

The spelling of 221364965 in words is "two hundred twenty-one million, three hundred sixty-four thousand, nine hundred sixty-five".