243154532221 has 12 divisors (see below), whose sum is σ = 258162442272. Its totient is φ = 228977485704.

The previous prime is 243154532213. The next prime is 243154532263. The reversal of 243154532221 is 122235451342.

It is not a de Polignac number, because 243154532221 - 2³ = 243154532213 is a prime.

It is a super-2 number, since 2×243154532221² (a number of 24 digits) contains 22 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 (243154532521) 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 11 ways as a sum of consecutive naturals, for example, 1956355 + ... + 2076928.

It is an arithmetic number, because the mean of its divisors is an integer number (21513536856).

Almost surely, 2^243154532221 is an apocalyptic number.

It is an amenable number.

243154532221 is a deficient number, since it is larger than the sum of its proper divisors (15007910051).

243154532221 is a wasteful number, since it uses less digits than its factorization.

243154532221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4033488 (or 4033469 counting only the distinct ones).

The product of its digits is 57600, while the sum is 34.

Adding to 243154532221 its reverse (122235451342), we get a palindrome (365389983563).

The spelling of 243154532221 in words is "two hundred forty-three billion, one hundred fifty-four million, five hundred thirty-two thousand, two hundred twenty-one".