243121245101 has 4 divisors (see below), whose sum is σ = 277852851552. Its totient is φ = 208389638652.

The previous prime is 243121245097. The next prime is 243121245109. The reversal of 243121245101 is 101542121342.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 101542121342 = 2 ⋅50771060671.

It is a cyclic number.

It is not a de Polignac number, because 243121245101 - 2² = 243121245097 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 (243121245109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17365803215 + ... + 17365803228.

It is an arithmetic number, because the mean of its divisors is an integer number (69463212888).

Almost surely, 2^243121245101 is an apocalyptic number.

It is an amenable number.

243121245101 is a deficient number, since it is larger than the sum of its proper divisors (34731606451).

243121245101 is an equidigital number, since it uses as much as digits as its factorization.

243121245101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34731606450.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 243121245101 its reverse (101542121342), we get a palindrome (344663366443).

The spelling of 243121245101 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-five thousand, one hundred one".