21115503054097 has 2 divisors, whose sum is σ = 21115503054098. Its totient is φ = 21115503054096.

The previous prime is 21115503054077. The next prime is 21115503054179. The reversal of 21115503054097 is 79045030551112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18229279219776 + 2886223834321 = 4269576^2 + 1698889^2 .

It is a cyclic number.

It is not a de Polignac number, because 21115503054097 - 2¹⁵ = 21115503021329 is a prime.

It is not a weakly prime, because it can be changed into another prime (21115503054077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10557751527048 + 10557751527049.

It is an arithmetic number, because the mean of its divisors is an integer number (10557751527049).

Almost surely, 2^{21115503054097} is an apocalyptic number.

It is an amenable number.

21115503054097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21115503054097 is an equidigital number, since it uses as much as digits as its factorization.

21115503054097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 189000, while the sum is 43.

The spelling of 21115503054097 in words is "twenty-one trillion, one hundred fifteen billion, five hundred three million, fifty-four thousand, ninety-seven".