243121245453 has 12 divisors (see below), whose sum is σ = 351188058780. Its totient is φ = 162074864256.

The previous prime is 243121245449. The next prime is 243121245469. The reversal of 243121245453 is 354542121342.

It is a happy number.

243121245453 is a `hidden beast` number, since 2 + 43 + 121 + 2 + 45 + 453 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 242303171049 + 818074404 = 492243^2 + 28602^2 .

It is not a de Polignac number, because 243121245453 - 2² = 243121245449 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243121245473) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 231618 + ... + 734771.

It is an arithmetic number, because the mean of its divisors is an integer number (29265671565).

Almost surely, 2^243121245453 is an apocalyptic number.

It is an amenable number.

243121245453 is a deficient number, since it is larger than the sum of its proper divisors (108066813327).

243121245453 is a wasteful number, since it uses less digits than its factorization.

243121245453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994348 (or 994345 counting only the distinct ones).

The product of its digits is 115200, while the sum is 36.

Adding to 243121245453 its reverse (354542121342), we get a palindrome (597663366795).

The spelling of 243121245453 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-five thousand, four hundred fifty-three".