331252021 has 8 divisors (see below), whose sum is σ = 356488344. Its totient is φ = 306654720.

The previous prime is 331252001. The next prime is 331252039. The reversal of 331252021 is 120252133.

It can be written as a sum of positive squares in 4 ways, for example, as 27447121 + 303804900 = 5239^2 + 17430^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 331252021 - 2⁵ = 331251989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 331252021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331252001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158680 + ... + 160753.

It is an arithmetic number, because the mean of its divisors is an integer number (44561043).

Almost surely, 2^331252021 is an apocalyptic number.

It is an amenable number.

331252021 is a deficient number, since it is larger than the sum of its proper divisors (25236323).

331252021 is a wasteful number, since it uses less digits than its factorization.

331252021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319511.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 331252021 is about 18200.3302442566. The cubic root of 331252021 is about 691.9151589718.

The spelling of 331252021 in words is "three hundred thirty-one million, two hundred fifty-two thousand, twenty-one".