331020221001 has 4 divisors (see below), whose sum is σ = 441360294672. Its totient is φ = 220680147332.

The previous prime is 331020220969. The next prime is 331020221009. The reversal of 331020221001 is 100122020133.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 331020221001 - 2⁵ = 331020220969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (331020221009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55170036831 + ... + 55170036836.

It is an arithmetic number, because the mean of its divisors is an integer number (110340073668).

Almost surely, 2^331020221001 is an apocalyptic number.

It is an amenable number.

331020221001 is a deficient number, since it is larger than the sum of its proper divisors (110340073671).

331020221001 is a wasteful number, since it uses less digits than its factorization.

331020221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110340073670.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 331020221001 its reverse (100122020133), we get a palindrome (431142241134).

The spelling of 331020221001 in words is "three hundred thirty-one billion, twenty million, two hundred twenty-one thousand, one".