243401431232221 has 4 divisors (see below), whose sum is σ = 244473684233472. Its totient is φ = 242329178230972.

The previous prime is 243401431232209. The next prime is 243401431232261. The reversal of 243401431232221 is 122232134104342.

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 243401431232221 - 2³¹ = 243399283748573 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 (243401431232261) 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, 536126500285 + ... + 536126500738.

It is an arithmetic number, because the mean of its divisors is an integer number (61118421058368).

Almost surely, 2^{243401431232221} is an apocalyptic number.

It is an amenable number.

243401431232221 is a deficient number, since it is larger than the sum of its proper divisors (1072253001251).

243401431232221 is a wasteful number, since it uses less digits than its factorization.

243401431232221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072253001250.

The product of its (nonzero) digits is 55296, while the sum is 34.

Adding to 243401431232221 its reverse (122232134104342), we get a palindrome (365633565336563).

The spelling of 243401431232221 in words is "two hundred forty-three trillion, four hundred one billion, four hundred thirty-one million, two hundred thirty-two thousand, two hundred twenty-one".