243242452021 has 2 divisors, whose sum is σ = 243242452022. Its totient is φ = 243242452020.

The previous prime is 243242452003. The next prime is 243242452039. The reversal of 243242452021 is 120254242342.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (243242452003) and next prime (243242452039).

It can be written as a sum of positive squares in only one way, i.e., 152092200100 + 91150251921 = 389990^2 + 301911^2 .

It is a cyclic number.

It is not a de Polignac number, because 243242452021 - 2¹¹ = 243242449973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243242452001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121621226010 + 121621226011.

It is an arithmetic number, because the mean of its divisors is an integer number (121621226011).

Almost surely, 2^243242452021 is an apocalyptic number.

It is an amenable number.

243242452021 is a deficient number, since it is larger than the sum of its proper divisors (1).

243242452021 is an equidigital number, since it uses as much as digits as its factorization.

243242452021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30720, while the sum is 31.

Adding to 243242452021 its reverse (120254242342), we get a palindrome (363496694363).

The spelling of 243242452021 in words is "two hundred forty-three billion, two hundred forty-two million, four hundred fifty-two thousand, twenty-one".