242515321 has 4 divisors (see below), whose sum is σ = 246491044. Its totient is φ = 238539600.

The previous prime is 242515307. The next prime is 242515331. The reversal of 242515321 is 123515242.

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 43705321 + 198810000 = 6611^2 + 14100^2 .

It is a cyclic number.

It is not a de Polignac number, because 242515321 - 2¹⁹ = 241991033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242515331) 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, 1987770 + ... + 1987891.

It is an arithmetic number, because the mean of its divisors is an integer number (61622761).

Almost surely, 2^242515321 is an apocalyptic number.

It is an amenable number.

242515321 is a deficient number, since it is larger than the sum of its proper divisors (3975723).

242515321 is an equidigital number, since it uses as much as digits as its factorization.

242515321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3975722.

The product of its digits is 2400, while the sum is 25.

The square root of 242515321 is about 15572.9034222909. The cubic root of 242515321 is about 623.6099847841.

The spelling of 242515321 in words is "two hundred forty-two million, five hundred fifteen thousand, three hundred twenty-one".