65028021 has 4 divisors (see below), whose sum is σ = 86704032. Its totient is φ = 43352012.

The previous prime is 65028017. The next prime is 65028037. The reversal of 65028021 is 12082056.

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 a cyclic number.

It is not a de Polignac number, because 65028021 - 2² = 65028017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65027982 and 65028000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65028001) 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, 10838001 + ... + 10838006.

It is an arithmetic number, because the mean of its divisors is an integer number (21676008).

Almost surely, 2^65028021 is an apocalyptic number.

It is an amenable number.

65028021 is a deficient number, since it is larger than the sum of its proper divisors (21676011).

65028021 is a wasteful number, since it uses less digits than its factorization.

65028021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21676010.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 65028021 is about 8063.9953497010. The cubic root of 65028021 is about 402.1303443567.

The spelling of 65028021 in words is "sixty-five million, twenty-eight thousand, twenty-one".