243122225021 has 4 divisors (see below), whose sum is σ = 261823934652. Its totient is φ = 224420515392.

The previous prime is 243122225011. The next prime is 243122225057. The reversal of 243122225021 is 120522221342.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 106230364900 + 136891860121 = 325930^2 + 369989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243122225021 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 (243122225011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9350854796 + ... + 9350854821.

It is an arithmetic number, because the mean of its divisors is an integer number (65455983663).

Almost surely, 2^243122225021 is an apocalyptic number.

It is an amenable number.

243122225021 is a deficient number, since it is larger than the sum of its proper divisors (18701709631).

243122225021 is a wasteful number, since it uses less digits than its factorization.

243122225021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18701709630.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 243122225021 its reverse (120522221342), we get a palindrome (363644446363).

The spelling of 243122225021 in words is "two hundred forty-three billion, one hundred twenty-two million, two hundred twenty-five thousand, twenty-one".