65421020 has 24 divisors (see below), whose sum is σ = 157010784. Its totient is φ = 22430016.

The previous prime is 65421001. The next prime is 65421043. The reversal of 65421020 is 2012456.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 65420983 and 65421001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233507 + ... + 233786.

It is an arithmetic number, because the mean of its divisors is an integer number (6542116).

Almost surely, 2^65421020 is an apocalyptic number.

It is an amenable number.

65421020 is an abundant number, since it is smaller than the sum of its proper divisors (91589764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65421020 is a wasteful number, since it uses less digits than its factorization.

65421020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467309 (or 467307 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 65421020 is about 8088.3261556394. The cubic root of 65421020 is about 402.9388138877.

Adding to 65421020 its reverse (2012456), we get a palindrome (67433476).

The spelling of 65421020 in words is "sixty-five million, four hundred twenty-one thousand, twenty".