65022021 has 20 divisors (see below), whose sum is σ = 97769452. Its totient is φ = 43063488.

The previous prime is 65022019. The next prime is 65022037. The reversal of 65022021 is 12022056.

It can be written as a sum of positive squares in 2 ways, for example, as 7049025 + 57972996 = 2655^2 + 7614^2 .

It is not a de Polignac number, because 65022021 - 2¹ = 65022019 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 65021985 and 65022003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65022011) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10161 + ... + 15273.

Almost surely, 2^65022021 is an apocalyptic number.

It is an amenable number.

65022021 is a deficient number, since it is larger than the sum of its proper divisors (32747431).

65022021 is a wasteful number, since it uses less digits than its factorization.

65022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5282 (or 5273 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 65022021 is about 8063.6233170951. The cubic root of 65022021 is about 402.1179760667.

Adding to 65022021 its reverse (12022056), we get a palindrome (77044077).

The spelling of 65022021 in words is "sixty-five million, twenty-two thousand, twenty-one".