321316040 has 32 divisors (see below), whose sum is σ = 723817080. Its totient is φ = 128374272.

The previous prime is 321315983. The next prime is 321316063. The reversal of 321316040 is 40613123.

It can be written as a sum of positive squares in 4 ways, for example, as 146071396 + 175244644 = 12086^2 + 13238^2 .

It is a super-2 number, since 2×321316040² = 206487995122563200, which contains 22 as substring.

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

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 33194 + ... + 41766.

Almost surely, 2^321316040 is an apocalyptic number.

It is an amenable number.

321316040 is an abundant number, since it is smaller than the sum of its proper divisors (402501040).

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

321316040 is a wasteful number, since it uses less digits than its factorization.

321316040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9521 (or 9517 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 321316040 is about 17925.2905136848. The cubic root of 321316040 is about 684.9267614880.

Adding to 321316040 its reverse (40613123), we get a palindrome (361929163).

The spelling of 321316040 in words is "three hundred twenty-one million, three hundred sixteen thousand, forty".