243454103021 has 2 divisors, whose sum is σ = 243454103022. Its totient is φ = 243454103020.

The previous prime is 243454103003. The next prime is 243454103041. The reversal of 243454103021 is 120301454342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221760937225 + 21693165796 = 470915^2 + 147286^2 .

It is a cyclic number.

It is not a de Polignac number, because 243454103021 - 2²² = 243449908717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243454103041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121727051510 + 121727051511.

It is an arithmetic number, because the mean of its divisors is an integer number (121727051511).

Almost surely, 2^243454103021 is an apocalyptic number.

It is an amenable number.

243454103021 is a deficient number, since it is larger than the sum of its proper divisors (1).

243454103021 is an equidigital number, since it uses as much as digits as its factorization.

243454103021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 243454103021 its reverse (120301454342), we get a palindrome (363755557363).

The spelling of 243454103021 in words is "two hundred forty-three billion, four hundred fifty-four million, one hundred three thousand, twenty-one".