242776730672521 has 4 divisors (see below), whose sum is σ = 247357423704132. Its totient is φ = 238196037640912.

The previous prime is 242776730672461. The next prime is 242776730672573. The reversal of 242776730672521 is 125276037677242.

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 74975925770496 + 167800804902025 = 8658864^2 + 12953795^2 .

It is a cyclic number.

It is not a de Polignac number, because 242776730672521 - 2¹⁹ = 242776730148233 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 242776730672521.

It is not an unprimeable number, because it can be changed into a prime (242776730670521) 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, 2290346515726 + ... + 2290346515831.

It is an arithmetic number, because the mean of its divisors is an integer number (61839355926033).

Almost surely, 2^{242776730672521} is an apocalyptic number.

It is an amenable number.

242776730672521 is a deficient number, since it is larger than the sum of its proper divisors (4580693031611).

242776730672521 is an equidigital number, since it uses as much as digits as its factorization.

242776730672521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4580693031610.

The product of its (nonzero) digits is 82978560, while the sum is 61.

The spelling of 242776730672521 in words is "two hundred forty-two trillion, seven hundred seventy-six billion, seven hundred thirty million, six hundred seventy-two thousand, five hundred twenty-one".