243115055221 has 8 divisors (see below), whose sum is σ = 243233365824. Its totient is φ = 242996782560.

The previous prime is 243115055207. The next prime is 243115055231. The reversal of 243115055221 is 122550511342.

243115055221 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 a cyclic number.

It is not a de Polignac number, because 243115055221 - 2⁷ = 243115055093 is a prime.

It is a super-3 number, since 3×243115055221³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243115055201) 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, 31096905 + ... + 31104721.

It is an arithmetic number, because the mean of its divisors is an integer number (30404170728).

Almost surely, 2^243115055221 is an apocalyptic number.

It is an amenable number.

243115055221 is a deficient number, since it is larger than the sum of its proper divisors (118310603).

243115055221 is an equidigital number, since it uses as much as digits as its factorization.

243115055221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18971.

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 243115055221 its reverse (122550511342), we get a palindrome (365665566563).

The spelling of 243115055221 in words is "two hundred forty-three billion, one hundred fifteen million, fifty-five thousand, two hundred twenty-one".