242941756654921 has 3 divisors (see below), whose sum is σ = 242941772241511. Its totient is φ = 242941741068332.

The previous prime is 242941756654913. The next prime is 242941756654979. The reversal of 242941756654921 is 129456657149242.

The square root of 242941756654921 is 15586589.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 72168609934521 + 170773146720400 = 8495211^2 + 13068020^2 .

It is not a de Polignac number, because 242941756654921 - 2³ = 242941756654913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242941756624921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7793295 + ... + 23379883.

Almost surely, 2^{242941756654921} is an apocalyptic number.

242941756654921 is the 15586589-th square number.

242941756654921 is the 7793295-th centered octagonal number.

It is an amenable number.

242941756654921 is a deficient number, since it is larger than the sum of its proper divisors (15586590).

242941756654921 is an frugal number, since it uses more digits than its factorization.

242941756654921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31173178 (or 15586589 counting only the distinct ones).

The product of its digits is 261273600, while the sum is 67.

The spelling of 242941756654921 in words is "two hundred forty-two trillion, nine hundred forty-one billion, seven hundred fifty-six million, six hundred fifty-four thousand, nine hundred twenty-one".