65842221 has 4 divisors (see below), whose sum is σ = 87789632. Its totient is φ = 43894812.

The previous prime is 65842219. The next prime is 65842223. The reversal of 65842221 is 12224856.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (65842219) and next prime (65842223).

It is not a de Polignac number, because 65842221 - 2¹ = 65842219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65842223) 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, 10973701 + ... + 10973706.

It is an arithmetic number, because the mean of its divisors is an integer number (21947408).

Almost surely, 2^65842221 is an apocalyptic number.

It is an amenable number.

65842221 is a deficient number, since it is larger than the sum of its proper divisors (21947411).

65842221 is a wasteful number, since it uses less digits than its factorization.

65842221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21947410.

The product of its digits is 7680, while the sum is 30.

The square root of 65842221 is about 8114.3219679774. The cubic root of 65842221 is about 403.8017133837.

The spelling of 65842221 in words is "sixty-five million, eight hundred forty-two thousand, two hundred twenty-one".