65221273 has 4 divisors (see below), whose sum is σ = 70238308. Its totient is φ = 60204240.

The previous prime is 65221259. The next prime is 65221297. The reversal of 65221273 is 37212256.

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 15264649 + 49956624 = 3907^2 + 7068^2 .

It is a cyclic number.

It is not a de Polignac number, because 65221273 - 2⁹ = 65220761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65221213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2508498 + ... + 2508523.

It is an arithmetic number, because the mean of its divisors is an integer number (17559577).

Almost surely, 2^65221273 is an apocalyptic number.

It is an amenable number.

65221273 is a deficient number, since it is larger than the sum of its proper divisors (5017035).

65221273 is a wasteful number, since it uses less digits than its factorization.

65221273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5017034.

The product of its digits is 5040, while the sum is 28.

The square root of 65221273 is about 8075.9688582857. The cubic root of 65221273 is about 402.5283042735.

The spelling of 65221273 in words is "sixty-five million, two hundred twenty-one thousand, two hundred seventy-three".