331143021 has 24 divisors (see below), whose sum is σ = 522377856. Its totient is φ = 200471040.

The previous prime is 331142971. The next prime is 331143047. The reversal of 331143021 is 120341133.

It is not a de Polignac number, because 331143021 - 2⁷ = 331142893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 331142985 and 331143003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331143091) 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 23 ways as a sum of consecutive naturals, for example, 155661 + ... + 157773.

It is an arithmetic number, because the mean of its divisors is an integer number (21765744).

Almost surely, 2^331143021 is an apocalyptic number.

It is an amenable number.

331143021 is a deficient number, since it is larger than the sum of its proper divisors (191234835).

331143021 is a wasteful number, since it uses less digits than its factorization.

331143021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3713 (or 3710 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 331143021 is about 18197.3355467222. The cubic root of 331143021 is about 691.8392580249.

Adding to 331143021 its reverse (120341133), we get a palindrome (451484154).

It can be divided in two parts, 3311430 and 21, that added together give a triangular number (3311451 = T₂₅₇₃).

The spelling of 331143021 in words is "three hundred thirty-one million, one hundred forty-three thousand, twenty-one".