331424021 has 4 divisors (see below), whose sum is σ = 331465344. Its totient is φ = 331382700.

The previous prime is 331424003. The next prime is 331424029. The reversal of 331424021 is 120424133.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 331424021 - 2⁶ = 331423957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 331423984 and 331424002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331424029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4325 + ... + 26106.

It is an arithmetic number, because the mean of its divisors is an integer number (82866336).

Almost surely, 2^331424021 is an apocalyptic number.

It is an amenable number.

331424021 is a deficient number, since it is larger than the sum of its proper divisors (41323).

331424021 is a wasteful number, since it uses less digits than its factorization.

331424021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41322.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 331424021 is about 18205.0548200218. The cubic root of 331424021 is about 692.0348954136.

Adding to 331424021 its reverse (120424133), we get a palindrome (451848154).

The spelling of 331424021 in words is "three hundred thirty-one million, four hundred twenty-four thousand, twenty-one".