321213040 has 40 divisors (see below), whose sum is σ = 762719040. Its totient is φ = 125750016.

The previous prime is 321213029. The next prime is 321213043. The reversal of 321213040 is 40312123.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

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 7 ways as a sum of consecutive naturals, for example, 38955 + ... + 46474.

It is an arithmetic number, because the mean of its divisors is an integer number (19067976).

Almost surely, 2^321213040 is an apocalyptic number.

It is an amenable number.

321213040 is an abundant number, since it is smaller than the sum of its proper divisors (441506000).

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

321213040 is a wasteful number, since it uses less digits than its factorization.

321213040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85489 (or 85483 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 321213040 is about 17922.4172476817. The cubic root of 321213040 is about 684.8535677191.

Adding to 321213040 its reverse (40312123), we get a palindrome (361525163).

The spelling of 321213040 in words is "three hundred twenty-one million, two hundred thirteen thousand, forty".