243245137074621 has 16 divisors (see below), whose sum is σ = 353813485485888. Its totient is φ = 147420304774400.

The previous prime is 243245137074581. The next prime is 243245137074631. The reversal of 243245137074621 is 126470731542342.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 243245137074621 - 2⁹ = 243245137074109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243245137074631) 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, 19759110 + ... + 29612711.

It is an arithmetic number, because the mean of its divisors is an integer number (22113342842868).

Almost surely, 2^{243245137074621} is an apocalyptic number.

It is an amenable number.

243245137074621 is a deficient number, since it is larger than the sum of its proper divisors (110568348411267).

243245137074621 is a wasteful number, since it uses less digits than its factorization.

243245137074621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49521132.

The product of its (nonzero) digits is 6773760, while the sum is 51.

The spelling of 243245137074621 in words is "two hundred forty-three trillion, two hundred forty-five billion, one hundred thirty-seven million, seventy-four thousand, six hundred twenty-one".