243155100021 has 8 divisors (see below), whose sum is σ = 326148158784. Its totient is φ = 161132720640.

The previous prime is 243155100007. The next prime is 243155100037. The reversal of 243155100021 is 120001551342.

It is a happy number.

243155100021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 243155100021 - 2¹⁹ = 243154575733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243155099964 and 243155100000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243155105021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 242669260 + ... + 242670261.

It is an arithmetic number, because the mean of its divisors is an integer number (40768519848).

Almost surely, 2^243155100021 is an apocalyptic number.

It is an amenable number.

243155100021 is a deficient number, since it is larger than the sum of its proper divisors (82993058763).

243155100021 is a wasteful number, since it uses less digits than its factorization.

243155100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485339691.

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 243155100021 its reverse (120001551342), we get a palindrome (363156651363).

The spelling of 243155100021 in words is "two hundred forty-three billion, one hundred fifty-five million, one hundred thousand, twenty-one".