331221001 has 8 divisors (see below), whose sum is σ = 340717608. Its totient is φ = 321792000.

The previous prime is 331220993. The next prime is 331221031. The reversal of 331221001 is 100122133.

It can be written as a sum of positive squares in 4 ways, for example, as 5382400 + 325838601 = 2320^2 + 18051^2 .

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 331221001 - 2³ = 331220993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331221031) 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, 6880 + ... + 26641.

It is an arithmetic number, because the mean of its divisors is an integer number (42589701).

Almost surely, 2^331221001 is an apocalyptic number.

It is an amenable number.

331221001 is a deficient number, since it is larger than the sum of its proper divisors (9496607).

331221001 is a wasteful number, since it uses less digits than its factorization.

331221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33803.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 331221001 is about 18199.4780419659. The cubic root of 331221001 is about 691.8935602324.

Adding to 331221001 its reverse (100122133), we get a palindrome (431343134).

The spelling of 331221001 in words is "three hundred thirty-one million, two hundred twenty-one thousand, one".