243121245451 has 16 divisors (see below), whose sum is σ = 287048028160. Its totient is φ = 201504140640.

The previous prime is 243121245449. The next prime is 243121245469. The reversal of 243121245451 is 154542121342.

It is a cyclic number.

It is not a de Polignac number, because 243121245451 - 2¹ = 243121245449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243121245421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184431 + ... + 721288.

It is an arithmetic number, because the mean of its divisors is an integer number (17940501760).

Almost surely, 2^243121245451 is an apocalyptic number.

243121245451 is a deficient number, since it is larger than the sum of its proper divisors (43926782709).

243121245451 is a wasteful number, since it uses less digits than its factorization.

243121245451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906994.

The product of its digits is 38400, while the sum is 34.

Adding to 243121245451 its reverse (154542121342), we get a palindrome (397663366793).

The spelling of 243121245451 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-five thousand, four hundred fifty-one".