321200001 has 12 divisors (see below), whose sum is σ = 468213460. Its totient is φ = 212168160.

The previous prime is 321199993. The next prime is 321200051. The reversal of 321200001 is 100002123.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 78588225 + 242611776 = 8865^2 + 15576^2 .

It is not a de Polignac number, because 321200001 - 2³ = 321199993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321200051) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 162730 + ... + 164691.

Almost surely, 2^321200001 is an apocalyptic number.

It is an amenable number.

321200001 is a deficient number, since it is larger than the sum of its proper divisors (147013459).

321200001 is a wasteful number, since it uses less digits than its factorization.

321200001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327536 (or 327533 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 321200001 is about 17922.0534816745. The cubic root of 321200001 is about 684.8443008407.

Adding to 321200001 its reverse (100002123), we get a palindrome (421202124).

The spelling of 321200001 in words is "three hundred twenty-one million, two hundred thousand, one".