321020001 has 6 divisors (see below), whose sum is σ = 463695570. Its totient is φ = 214013328.

The previous prime is 321019967. The next prime is 321020017. The reversal of 321020001 is 100020123.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 254434401 + 66585600 = 15951^2 + 8160^2 .

It is not a de Polignac number, because 321020001 - 2¹³ = 321011809 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 35668889 = 321020001 / (3 + 2 + 1 + 0 + 2 + 0 + 0 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (321020041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17834436 + ... + 17834453.

It is an arithmetic number, because the mean of its divisors is an integer number (77282595).

Almost surely, 2^321020001 is an apocalyptic number.

It is an amenable number.

321020001 is a deficient number, since it is larger than the sum of its proper divisors (142675569).

321020001 is a wasteful number, since it uses less digits than its factorization.

321020001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35668895 (or 35668892 counting only the distinct ones).

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

The square root of 321020001 is about 17917.0310319539. The cubic root of 321020001 is about 684.7163483625.

Adding to 321020001 its reverse (100020123), we get a palindrome (421040124).

The spelling of 321020001 in words is "three hundred twenty-one million, twenty thousand, one".