331411021 has 4 divisors (see below), whose sum is σ = 335950972. Its totient is φ = 326871072.

The previous prime is 331411013. The next prime is 331411057. The reversal of 331411021 is 120114133.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 76370121 + 255040900 = 8739^2 + 15970^2 .

It is a cyclic number.

It is not a de Polignac number, because 331411021 - 2³ = 331411013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 331410986 and 331411004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331411001) 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, 2269866 + ... + 2270011.

It is an arithmetic number, because the mean of its divisors is an integer number (83987743).

Almost surely, 2^331411021 is an apocalyptic number.

It is an amenable number.

331411021 is a deficient number, since it is larger than the sum of its proper divisors (4539951).

331411021 is an equidigital number, since it uses as much as digits as its factorization.

331411021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4539950.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 331411021 is about 18204.6977728278. The cubic root of 331411021 is about 692.0258470137.

Adding to 331411021 its reverse (120114133), we get a palindrome (451525154).

The spelling of 331411021 in words is "three hundred thirty-one million, four hundred eleven thousand, twenty-one".