65221001 has 4 divisors (see below), whose sum is σ = 65798292. Its totient is φ = 64643712.

The previous prime is 65220979. The next prime is 65221043. The reversal of 65221001 is 10012256.

65221001 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.

It can be written as a sum of positive squares in 2 ways, for example, as 900601 + 64320400 = 949^2 + 8020^2 .

It is a cyclic number.

It is not a de Polignac number, because 65221001 - 2²² = 61026697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65221081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288476 + ... + 288701.

It is an arithmetic number, because the mean of its divisors is an integer number (16449573).

Almost surely, 2^65221001 is an apocalyptic number.

It is an amenable number.

65221001 is a deficient number, since it is larger than the sum of its proper divisors (577291).

65221001 is a wasteful number, since it uses less digits than its factorization.

65221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577290.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 65221001 is about 8075.9520181834. The cubic root of 65221001 is about 402.5277447022.

Adding to 65221001 its reverse (10012256), we get a palindrome (75233257).

The spelling of 65221001 in words is "sixty-five million, two hundred twenty-one thousand, one".