243121242451 has 8 divisors (see below), whose sum is σ = 251555762880. Its totient is φ = 234690124032.

The previous prime is 243121242449. The next prime is 243121242491. The reversal of 243121242451 is 154242121342.

243121242451 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243121242451 - 2¹ = 243121242449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243121242491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 704670 + ... + 991363.

It is an arithmetic number, because the mean of its divisors is an integer number (31444470360).

Almost surely, 2^243121242451 is an apocalyptic number.

243121242451 is a deficient number, since it is larger than the sum of its proper divisors (8434520429).

243121242451 is a wasteful number, since it uses less digits than its factorization.

243121242451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1701005.

The product of its digits is 15360, while the sum is 31.

Adding to 243121242451 its reverse (154242121342), we get a palindrome (397363363793).

The spelling of 243121242451 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-two thousand, four hundred fifty-one".