21503034210241 has 2 divisors, whose sum is σ = 21503034210242. Its totient is φ = 21503034210240.

The previous prime is 21503034210233. The next prime is 21503034210337. The reversal of 21503034210241 is 14201243030512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21502891168641 + 143041600 = 4637121^2 + 11960^2 .

It is a cyclic number.

It is not a de Polignac number, because 21503034210241 - 2³ = 21503034210233 is a prime.

It is not a weakly prime, because it can be changed into another prime (21503034210641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10751517105120 + 10751517105121.

It is an arithmetic number, because the mean of its divisors is an integer number (10751517105121).

Almost surely, 2^{21503034210241} is an apocalyptic number.

It is an amenable number.

21503034210241 is a deficient number, since it is larger than the sum of its proper divisors (1).

21503034210241 is an equidigital number, since it uses as much as digits as its factorization.

21503034210241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 21503034210241 its reverse (14201243030512), we get a palindrome (35704277240753).

The spelling of 21503034210241 in words is "twenty-one trillion, five hundred three billion, thirty-four million, two hundred ten thousand, two hundred forty-one".