321240045 has 32 divisors (see below), whose sum is σ = 588091392. Its totient is φ = 146682432.

The previous prime is 321240037. The next prime is 321240053. The reversal of 321240045 is 540042123.

It is an interprime number because it is at equal distance from previous prime (321240037) and next prime (321240053).

It is not a de Polignac number, because 321240045 - 2³ = 321240037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154684 + ... + 156746.

It is an arithmetic number, because the mean of its divisors is an integer number (18377856).

Almost surely, 2^321240045 is an apocalyptic number.

321240045 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

321240045 is a deficient number, since it is larger than the sum of its proper divisors (266851347).

321240045 is a wasteful number, since it uses less digits than its factorization.

321240045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3561.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 321240045 is about 17923.1706179459. The cubic root of 321240045 is about 684.8727595015.

Adding to 321240045 its reverse (540042123), we get a palindrome (861282168).

The spelling of 321240045 in words is "three hundred twenty-one million, two hundred forty thousand, forty-five".