65042221 has 8 divisors (see below), whose sum is σ = 68939640. Its totient is φ = 61152768.

The previous prime is 65042213. The next prime is 65042231. The reversal of 65042221 is 12224056.

It can be written as a sum of positive squares in 4 ways, for example, as 22610025 + 42432196 = 4755^2 + 6514^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65042221 - 2³ = 65042213 is a prime.

It is a super-2 number, since 2×65042221² = 8460981025225682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65042192 and 65042201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65042231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27015 + ... + 29323.

It is an arithmetic number, because the mean of its divisors is an integer number (8617455).

Almost surely, 2^65042221 is an apocalyptic number.

It is an amenable number.

65042221 is a deficient number, since it is larger than the sum of its proper divisors (3897419).

65042221 is a wasteful number, since it uses less digits than its factorization.

65042221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3983.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 65042221 is about 8064.8757584975. The cubic root of 65042221 is about 402.1596129459.

Adding to 65042221 its reverse (12224056), we get a palindrome (77266277).

The spelling of 65042221 in words is "sixty-five million, forty-two thousand, two hundred twenty-one".