65280021 has 8 divisors (see below), whose sum is σ = 87116640. Its totient is φ = 43481712.

The previous prime is 65280013. The next prime is 65280041. The reversal of 65280021 is 12008256.

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

It is not a de Polignac number, because 65280021 - 2³ = 65280013 is a prime.

It is a super-2 number, since 2×65280021² = 8522962283520882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 65279973 and 65280000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65280001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5331 + ... + 12608.

It is an arithmetic number, because the mean of its divisors is an integer number (10889580).

Almost surely, 2^65280021 is an apocalyptic number.

It is an amenable number.

65280021 is a deficient number, since it is larger than the sum of its proper divisors (21836619).

65280021 is a wasteful number, since it uses less digits than its factorization.

65280021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19155.

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

The square root of 65280021 is about 8079.6052502582. The cubic root of 65280021 is about 402.6491270003.

Adding to 65280021 its reverse (12008256), we get a palindrome (77288277).

The spelling of 65280021 in words is "sixty-five million, two hundred eighty thousand, twenty-one".