242721025 has 24 divisors (see below), whose sum is σ = 315542304. Its totient is φ = 185001600.

The previous prime is 242721007. The next prime is 242721043. The reversal of 242721025 is 520127242.

It is an interprime number because it is at equal distance from previous prime (242721007) and next prime (242721043).

It is not a de Polignac number, because 242721025 - 2¹⁹ = 242196737 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41322 + ... + 46828.

It is an arithmetic number, because the mean of its divisors is an integer number (13147596).

Almost surely, 2^242721025 is an apocalyptic number.

242721025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

242721025 is a deficient number, since it is larger than the sum of its proper divisors (72821279).

242721025 is a wasteful number, since it uses less digits than its factorization.

242721025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5601 (or 5596 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 242721025 is about 15579.5065711338. The cubic root of 242721025 is about 623.7862524328.

Adding to 242721025 its reverse (520127242), we get a palindrome (762848267).

The spelling of 242721025 in words is "two hundred forty-two million, seven hundred twenty-one thousand, twenty-five".