243121230544 has 20 divisors (see below), whose sum is σ = 472404880224. Its totient is φ = 121210293728.

The previous prime is 243121230529. The next prime is 243121230559. The reversal of 243121230544 is 445032121342.

It is an interprime number because it is at equal distance from previous prime (243121230529) and next prime (243121230559).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21889372 + ... + 21900475.

Almost surely, 2^243121230544 is an apocalyptic number.

It is an amenable number.

243121230544 is a deficient number, since it is larger than the sum of its proper divisors (229283649680).

243121230544 is a wasteful number, since it uses less digits than its factorization.

243121230544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43790202 (or 43790196 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 31.

Adding to 243121230544 its reverse (445032121342), we get a palindrome (688153351886).

The spelling of 243121230544 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred thirty thousand, five hundred forty-four".