331349021 has 4 divisors (see below), whose sum is σ = 331390752. Its totient is φ = 331307292.

The previous prime is 331349009. The next prime is 331349069. The reversal of 331349021 is 120943133.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120943133 = 43 ⋅2812631.

It is a cyclic number.

It is not a de Polignac number, because 331349021 - 2⁶ = 331348957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331349071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4865 + ... + 26198.

It is an arithmetic number, because the mean of its divisors is an integer number (82847688).

Almost surely, 2^331349021 is an apocalyptic number.

It is an amenable number.

331349021 is a deficient number, since it is larger than the sum of its proper divisors (41731).

331349021 is a wasteful number, since it uses less digits than its factorization.

331349021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41730.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 331349021 is about 18202.9948360153. The cubic root of 331349021 is about 691.9826898507.

The spelling of 331349021 in words is "three hundred thirty-one million, three hundred forty-nine thousand, twenty-one".