247042321 has 4 divisors (see below), whose sum is σ = 247112944. Its totient is φ = 246971700.

The previous prime is 247042319. The next prime is 247042339. The reversal of 247042321 is 123240742.

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 an emirpimes, since its reverse is a distinct semiprime: 123240742 = 2 ⋅61620371.

It is a cyclic number.

It is not a de Polignac number, because 247042321 - 2¹ = 247042319 is a prime.

It is a super-2 number, since 2×247042321² = 122059816730134082, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (247042361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29775 + ... + 37156.

It is an arithmetic number, because the mean of its divisors is an integer number (61778236).

Almost surely, 2^247042321 is an apocalyptic number.

It is an amenable number.

247042321 is a deficient number, since it is larger than the sum of its proper divisors (70623).

247042321 is an equidigital number, since it uses as much as digits as its factorization.

247042321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70622.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 247042321 is about 15717.5799982058. The cubic root of 247042321 is about 627.4663683609.

The spelling of 247042321 in words is "two hundred forty-seven million, forty-two thousand, three hundred twenty-one".