321225021 has 40 divisors (see below), whose sum is σ = 521779104. Its totient is φ = 195760800.

The previous prime is 321225019. The next prime is 321225041. The reversal of 321225021 is 120522123.

It is not a de Polignac number, because 321225021 - 2¹ = 321225019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 321224985 and 321225003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321225011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 111246 + ... + 114096.

Almost surely, 2^321225021 is an apocalyptic number.

It is an amenable number.

321225021 is a deficient number, since it is larger than the sum of its proper divisors (200554083).

321225021 is a wasteful number, since it uses less digits than its factorization.

321225021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2983 (or 2974 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 321225021 is about 17922.7514907728. The cubic root of 321225021 is about 684.8620824508.

Adding to 321225021 its reverse (120522123), we get a palindrome (441747144).

The spelling of 321225021 in words is "three hundred twenty-one million, two hundred twenty-five thousand, twenty-one".