243226340821 has 16 divisors (see below), whose sum is σ = 271123329600. Its totient is φ = 216842427648.

The previous prime is 243226340813. The next prime is 243226340837. The reversal of 243226340821 is 128043622342.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 243226340821 - 2³ = 243226340813 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 (243226340891) 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, 2682495 + ... + 2771683.

It is an arithmetic number, because the mean of its divisors is an integer number (16945208100).

Almost surely, 2^243226340821 is an apocalyptic number.

It is an amenable number.

243226340821 is a deficient number, since it is larger than the sum of its proper divisors (27896988779).

243226340821 is a wasteful number, since it uses less digits than its factorization.

243226340821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97668.

The product of its (nonzero) digits is 110592, while the sum is 37.

The spelling of 243226340821 in words is "two hundred forty-three billion, two hundred twenty-six million, three hundred forty thousand, eight hundred twenty-one".