243746406421 has 16 divisors (see below), whose sum is σ = 280729139328. Its totient is φ = 207304531200.

The previous prime is 243746406377. The next prime is 243746406439. The reversal of 243746406421 is 124604647342.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 243746406421 - 2¹⁵ = 243746373653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243746406451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11867641 + ... + 11888161.

It is an arithmetic number, because the mean of its divisors is an integer number (17545571208).

Almost surely, 2^243746406421 is an apocalyptic number.

It is an amenable number.

243746406421 is a deficient number, since it is larger than the sum of its proper divisors (36982732907).

243746406421 is a wasteful number, since it uses less digits than its factorization.

243746406421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33612.

The product of its (nonzero) digits is 774144, while the sum is 43.

The spelling of 243746406421 in words is "two hundred forty-three billion, seven hundred forty-six million, four hundred six thousand, four hundred twenty-one".