243121403032245 has 12 divisors (see below), whose sum is σ = 421410431922636. Its totient is φ = 129664748283840.

The previous prime is 243121403032223. The next prime is 243121403032279. The reversal of 243121403032245 is 542230304121342.

243121403032245 is a `hidden beast` number, since 2 + 4 + 3 + 1 + 2 + 1 + 403 + 0 + 3 + 2 + 245 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 139241746405476 + 103879656626769 = 11800074^2 + 10192137^2 .

It is not a de Polignac number, because 243121403032245 - 2⁵ = 243121403032213 is a prime.

It is a super-2 number, since 2×243121403032245² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2701348922536 + ... + 2701348922625.

It is an arithmetic number, because the mean of its divisors is an integer number (35117535993553).

Almost surely, 2^{243121403032245} is an apocalyptic number.

It is an amenable number.

243121403032245 is a deficient number, since it is larger than the sum of its proper divisors (178289028890391).

243121403032245 is a wasteful number, since it uses less digits than its factorization.

243121403032245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5402697845172 (or 5402697845169 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 36.

Adding to 243121403032245 its reverse (542230304121342), we get a palindrome (785351707153587).

The spelling of 243121403032245 in words is "two hundred forty-three trillion, one hundred twenty-one billion, four hundred three million, thirty-two thousand, two hundred forty-five".