321405045 has 48 divisors (see below), whose sum is σ = 586244160. Its totient is φ = 149879808.

The previous prime is 321405031. The next prime is 321405047. The reversal of 321405045 is 540504123.

It is not a de Polignac number, because 321405045 - 2⁶ = 321404981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321405047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44829 + ... + 51501.

It is an arithmetic number, because the mean of its divisors is an integer number (12213420).

Almost surely, 2^321405045 is an apocalyptic number.

It is an amenable number.

321405045 is a deficient number, since it is larger than the sum of its proper divisors (264839115).

321405045 is a wasteful number, since it uses less digits than its factorization.

321405045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6726 (or 6713 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 321405045 is about 17927.7730072645. The cubic root of 321405045 is about 684.9899975452.

Adding to 321405045 its reverse (540504123), we get a palindrome (861909168).

The spelling of 321405045 in words is "three hundred twenty-one million, four hundred five thousand, forty-five".