243121222141 has 4 divisors (see below), whose sum is σ = 277852825312. Its totient is φ = 208389618972.

The previous prime is 243121222129. The next prime is 243121222147. The reversal of 243121222141 is 141222121342.

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.

It is a cyclic number.

It is not a de Polignac number, because 243121222141 - 2⁷ = 243121222013 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 (243121222147) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 17365801575 + ... + 17365801588.

It is an arithmetic number, because the mean of its divisors is an integer number (69463206328).

Almost surely, 2^243121222141 is an apocalyptic number.

It is an amenable number.

243121222141 is a deficient number, since it is larger than the sum of its proper divisors (34731603171).

243121222141 is an equidigital number, since it uses as much as digits as its factorization.

243121222141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34731603170.

The product of its digits is 1536, while the sum is 25.

Adding to 243121222141 its reverse (141222121342), we get a palindrome (384343343483).

The spelling of 243121222141 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred forty-one".