242821525 has 6 divisors (see below), whose sum is σ = 301098722. Its totient is φ = 194257200.

The previous prime is 242821499. The next prime is 242821529. The reversal of 242821525 is 525128242.

It can be written as a sum of positive squares in 3 ways, for example, as 22801 + 242798724 = 151^2 + 15582^2 .

It is not a de Polignac number, because 242821525 - 2²¹ = 240724373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242821529) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4856406 + ... + 4856455.

Almost surely, 2^242821525 is an apocalyptic number.

242821525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

242821525 is a deficient number, since it is larger than the sum of its proper divisors (58277197).

242821525 is an equidigital number, since it uses as much as digits as its factorization.

242821525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9712871 (or 9712866 counting only the distinct ones).

The product of its digits is 12800, while the sum is 31.

The square root of 242821525 is about 15582.7316283122. The cubic root of 242821525 is about 623.8723346169.

Adding to 242821525 its reverse (525128242), we get a palindrome (767949767).

The spelling of 242821525 in words is "two hundred forty-two million, eight hundred twenty-one thousand, five hundred twenty-five".