21253100255641 has 2 divisors, whose sum is σ = 21253100255642. Its totient is φ = 21253100255640.

The previous prime is 21253100255599. The next prime is 21253100255713. The reversal of 21253100255641 is 14655200135212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15133928355225 + 6119171900416 = 3890235^2 + 2473696^2 .

It is a cyclic number.

It is not a de Polignac number, because 21253100255641 - 2⁴¹ = 19054077000089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21253100255641.

It is not a weakly prime, because it can be changed into another prime (21253100255741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10626550127820 + 10626550127821.

It is an arithmetic number, because the mean of its divisors is an integer number (10626550127821).

Almost surely, 2^{21253100255641} is an apocalyptic number.

It is an amenable number.

21253100255641 is a deficient number, since it is larger than the sum of its proper divisors (1).

21253100255641 is an equidigital number, since it uses as much as digits as its factorization.

21253100255641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72000, while the sum is 37.

The spelling of 21253100255641 in words is "twenty-one trillion, two hundred fifty-three billion, one hundred million, two hundred fifty-five thousand, six hundred forty-one".