332540821 has 2 divisors, whose sum is σ = 332540822. Its totient is φ = 332540820.

The previous prime is 332540809. The next prime is 332540833. The reversal of 332540821 is 128045233.

It is a balanced prime because it is at equal distance from previous prime (332540809) and next prime (332540833).

It can be written as a sum of positive squares in only one way, i.e., 305760196 + 26780625 = 17486^2 + 5175^2 .

It is an emirp because it is prime and its reverse (128045233) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 332540821 - 2¹⁹ = 332016533 is a prime.

It is a super-2 number, since 2×332540821² = 221166795262708082, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 332540821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (332540851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166270410 + 166270411.

It is an arithmetic number, because the mean of its divisors is an integer number (166270411).

Almost surely, 2^332540821 is an apocalyptic number.

It is an amenable number.

332540821 is a deficient number, since it is larger than the sum of its proper divisors (1).

332540821 is an equidigital number, since it uses as much as digits as its factorization.

332540821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 332540821 is about 18235.7018236206. The cubic root of 332540821 is about 692.8113409297.

The spelling of 332540821 in words is "three hundred thirty-two million, five hundred forty thousand, eight hundred twenty-one".