321224660 has 12 divisors (see below), whose sum is σ = 674571828. Its totient is φ = 128489856.

The previous prime is 321224653. The next prime is 321224671. The reversal of 321224660 is 66422123.

It can be written as a sum of positive squares in 2 ways, for example, as 252301456 + 68923204 = 15884^2 + 8302^2 .

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 3 ways as a sum of consecutive naturals, for example, 8030597 + ... + 8030636.

It is an arithmetic number, because the mean of its divisors is an integer number (56214319).

Almost surely, 2^321224660 is an apocalyptic number.

It is an amenable number.

321224660 is an abundant number, since it is smaller than the sum of its proper divisors (353347168).

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

321224660 is a wasteful number, since it uses less digits than its factorization.

321224660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16061242 (or 16061240 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 321224660 is about 17922.7414197717. The cubic root of 321224660 is about 684.8618258962.

Adding to 321224660 its reverse (66422123), we get a palindrome (387646783).

It can be divided in two parts, 3212 and 24660, that added together give a palindrome (27872).

The spelling of 321224660 in words is "three hundred twenty-one million, two hundred twenty-four thousand, six hundred sixty".