331130021 has 8 divisors (see below), whose sum is σ = 339216384. Its totient is φ = 323129520.

The previous prime is 331129999. The next prime is 331130053. The reversal of 331130021 is 120031133.

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 331130021 - 2¹⁸ = 330867877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 331129978 and 331130005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331130221) 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, 13625 + ... + 29118.

It is an arithmetic number, because the mean of its divisors is an integer number (42402048).

Almost surely, 2^331130021 is an apocalyptic number.

It is an amenable number.

331130021 is a deficient number, since it is larger than the sum of its proper divisors (8086363).

331130021 is a wasteful number, since it uses less digits than its factorization.

331130021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42931.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 331130021 is about 18196.9783480665. The cubic root of 331130021 is about 691.8302045067.

Adding to 331130021 its reverse (120031133), we get a palindrome (451161154).

The spelling of 331130021 in words is "three hundred thirty-one million, one hundred thirty thousand, twenty-one".