320421641 has 8 divisors (see below), whose sum is σ = 322603200. Its totient is φ = 318246192.

The previous prime is 320421637. The next prime is 320421649. The reversal of 320421641 is 146124023.

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

It is a cyclic number.

It is not a de Polignac number, because 320421641 - 2² = 320421637 is a prime.

It is a super-2 number, since 2×320421641² = 205340056042265762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320421649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152786 + ... + 154868.

It is an arithmetic number, because the mean of its divisors is an integer number (40325400).

Almost surely, 2^320421641 is an apocalyptic number.

It is an amenable number.

320421641 is a deficient number, since it is larger than the sum of its proper divisors (2181559).

320421641 is a wasteful number, since it uses less digits than its factorization.

320421641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3055.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 320421641 is about 17900.3251646444. The cubic root of 320421641 is about 684.2906618088.

Adding to 320421641 its reverse (146124023), we get a palindrome (466545664).

The spelling of 320421641 in words is "three hundred twenty million, four hundred twenty-one thousand, six hundred forty-one".