242929721 has 2 divisors, whose sum is σ = 242929722. Its totient is φ = 242929720.

The previous prime is 242929691. The next prime is 242929751. The reversal of 242929721 is 127929242.

It is a balanced prime because it is at equal distance from previous prime (242929691) and next prime (242929751).

It can be written as a sum of positive squares in only one way, i.e., 188760121 + 54169600 = 13739^2 + 7360^2 .

It is a cyclic number.

It is not a de Polignac number, because 242929721 - 2¹⁴ = 242913337 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (242929751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121464860 + 121464861.

It is an arithmetic number, because the mean of its divisors is an integer number (121464861).

Almost surely, 2^242929721 is an apocalyptic number.

It is an amenable number.

242929721 is a deficient number, since it is larger than the sum of its proper divisors (1).

242929721 is an equidigital number, since it uses as much as digits as its factorization.

242929721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 38.

The square root of 242929721 is about 15586.2029051338. The cubic root of 242929721 is about 623.9649821805.

The spelling of 242929721 in words is "two hundred forty-two million, nine hundred twenty-nine thousand, seven hundred twenty-one".