243121240025 has 24 divisors (see below), whose sum is σ = 310249351104. Its totient is φ = 188854545600.

The previous prime is 243121240001. The next prime is 243121240049. The reversal of 243121240025 is 520042121342.

It is an interprime number because it is at equal distance from previous prime (243121240001) and next prime (243121240049).

It is a de Polignac number, because none of the positive numbers 2^k-243121240025 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243121239976 and 243121240003.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 186524 + ... + 721826.

It is an arithmetic number, because the mean of its divisors is an integer number (12927056296).

Almost surely, 2^243121240025 is an apocalyptic number.

243121240025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

243121240025 is a deficient number, since it is larger than the sum of its proper divisors (67128111079).

243121240025 is a wasteful number, since it uses less digits than its factorization.

243121240025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535841 (or 535836 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 243121240025 its reverse (520042121342), we get a palindrome (763163361367).

The spelling of 243121240025 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty thousand, twenty-five".