65421321 has 48 divisors (see below), whose sum is σ = 109921536. Its totient is φ = 34374144.

The previous prime is 65421311. The next prime is 65421329. The reversal of 65421321 is 12312456.

It is not a de Polignac number, because 65421321 - 2⁷ = 65421193 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 65421291 and 65421300.

It is not an unprimeable number, because it can be changed into a prime (65421329) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 117175 + ... + 117731.

It is an arithmetic number, because the mean of its divisors is an integer number (2290032).

Almost surely, 2^65421321 is an apocalyptic number.

It is an amenable number.

65421321 is a deficient number, since it is larger than the sum of its proper divisors (44500215).

65421321 is a wasteful number, since it uses less digits than its factorization.

65421321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638 (or 631 counting only the distinct ones).

The product of its digits is 1440, while the sum is 24.

The square root of 65421321 is about 8088.3447626817. The cubic root of 65421321 is about 402.9394318562.

Adding to 65421321 its reverse (12312456), we get a palindrome (77733777).

The spelling of 65421321 in words is "sixty-five million, four hundred twenty-one thousand, three hundred twenty-one".