65839221 has 24 divisors (see below), whose sum is σ = 110535360. Its totient is φ = 36982656.

The previous prime is 65839219. The next prime is 65839231. The reversal of 65839221 is 12293856.

It is not a de Polignac number, because 65839221 - 2¹ = 65839219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65839201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5140 + ... + 12573.

It is an arithmetic number, because the mean of its divisors is an integer number (4605640).

Almost surely, 2^65839221 is an apocalyptic number.

It is an amenable number.

65839221 is a deficient number, since it is larger than the sum of its proper divisors (44696139).

65839221 is a wasteful number, since it uses less digits than its factorization.

65839221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17785 (or 17782 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 65839221 is about 8114.1371075426. The cubic root of 65839221 is about 403.7955804216.

The spelling of 65839221 in words is "sixty-five million, eight hundred thirty-nine thousand, two hundred twenty-one".