321213045 has 16 divisors (see below), whose sum is σ = 544173120. Its totient is φ = 161236224.

The previous prime is 321213043. The next prime is 321213049. The reversal of 321213045 is 540312123.

It is not a de Polignac number, because 321213045 - 2¹ = 321213043 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321213043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 629575 + ... + 630084.

It is an arithmetic number, because the mean of its divisors is an integer number (34010820).

Almost surely, 2^321213045 is an apocalyptic number.

It is an amenable number.

321213045 is a deficient number, since it is larger than the sum of its proper divisors (222960075).

321213045 is a wasteful number, since it uses less digits than its factorization.

321213045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1259684.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 321213045 is about 17922.4173871719. The cubic root of 321213045 is about 684.8535712726.

Adding to 321213045 its reverse (540312123), we get a palindrome (861525168).

The spelling of 321213045 in words is "three hundred twenty-one million, two hundred thirteen thousand, forty-five".