243212140023221 has 4 divisors (see below), whose sum is σ = 243212176233600. Its totient is φ = 243212103812844.

The previous prime is 243212140023197. The next prime is 243212140023227. The reversal of 243212140023221 is 122320041212342.

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 243212140023221 - 2⁶ = 243212140023157 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 (243212140023227) 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, 4742981 + ... + 22559258.

It is an arithmetic number, because the mean of its divisors is an integer number (60803044058400).

Almost surely, 2^{243212140023221} is an apocalyptic number.

It is an amenable number.

243212140023221 is a deficient number, since it is larger than the sum of its proper divisors (36210379).

243212140023221 is an equidigital number, since it uses as much as digits as its factorization.

243212140023221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36210378.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 243212140023221 its reverse (122320041212342), we get a palindrome (365532181235563).

The spelling of 243212140023221 in words is "two hundred forty-three trillion, two hundred twelve billion, one hundred forty million, twenty-three thousand, two hundred twenty-one".