321220001 has 8 divisors (see below), whose sum is σ = 335482560. Its totient is φ = 306982192.

The previous prime is 321219989. The next prime is 321220021. The reversal of 321220001 is 100022123.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 321220001 - 2⁶ = 321219937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321220021) 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, 23411 + ... + 34503.

It is an arithmetic number, because the mean of its divisors is an integer number (41935320).

Almost surely, 2^321220001 is an apocalyptic number.

It is an amenable number.

321220001 is a deficient number, since it is larger than the sum of its proper divisors (14262559).

321220001 is a wasteful number, since it uses less digits than its factorization.

321220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12375.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 321220001 is about 17922.6114447644. The cubic root of 321220001 is about 684.8585148317.

Adding to 321220001 its reverse (100022123), we get a palindrome (421242124).

The spelling of 321220001 in words is "three hundred twenty-one million, two hundred twenty thousand, one".