243155050421 has 4 divisors (see below), whose sum is σ = 244226218272. Its totient is φ = 242083882572.

The previous prime is 243155050379. The next prime is 243155050423. The reversal of 243155050421 is 124050551342.

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 243155050421 - 2¹⁸ = 243154788277 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 (243155050423) 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, 535583585 + ... + 535584038.

It is an arithmetic number, because the mean of its divisors is an integer number (61056554568).

Almost surely, 2^243155050421 is an apocalyptic number.

It is an amenable number.

243155050421 is a deficient number, since it is larger than the sum of its proper divisors (1071167851).

243155050421 is a wasteful number, since it uses less digits than its factorization.

243155050421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071167850.

The product of its (nonzero) digits is 24000, while the sum is 32.

The spelling of 243155050421 in words is "two hundred forty-three billion, one hundred fifty-five million, fifty thousand, four hundred twenty-one".