321221001 has 8 divisors (see below), whose sum is σ = 453488544. Its totient is φ = 201550400.

The previous prime is 321220943. The next prime is 321221027. The reversal of 321221001 is 100122123.

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 321221001 - 2¹⁴ = 321204617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (321221041) 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 7 ways as a sum of consecutive naturals, for example, 3149175 + ... + 3149276.

It is an arithmetic number, because the mean of its divisors is an integer number (56686068).

Almost surely, 2^321221001 is an apocalyptic number.

It is an amenable number.

321221001 is a deficient number, since it is larger than the sum of its proper divisors (132267543).

321221001 is a wasteful number, since it uses less digits than its factorization.

321221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6298471.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 321221001 is about 17922.6393424629. The cubic root of 321221001 is about 684.8592255158.

Adding to 321221001 its reverse (100122123), we get a palindrome (421343124).

The spelling of 321221001 in words is "three hundred twenty-one million, two hundred twenty-one thousand, one".