21115503400001 has 2 divisors, whose sum is σ = 21115503400002. Its totient is φ = 21115503400000.

The previous prime is 21115503399967. The next prime is 21115503400031. The reversal of 21115503400001 is 10000430551112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14067412929025 + 7048090470976 = 3750655^2 + 2654824^2 .

It is a cyclic number.

It is not a de Polignac number, because 21115503400001 - 2¹⁴ = 21115503383617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21115503400001.

It is not a weakly prime, because it can be changed into another prime (21115503400031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10557751700000 + 10557751700001.

It is an arithmetic number, because the mean of its divisors is an integer number (10557751700001).

Almost surely, 2^{21115503400001} is an apocalyptic number.

It is an amenable number.

21115503400001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21115503400001 is an equidigital number, since it uses as much as digits as its factorization.

21115503400001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 21115503400001 its reverse (10000430551112), we get a palindrome (31115933951113).

The spelling of 21115503400001 in words is "twenty-one trillion, one hundred fifteen billion, five hundred three million, four hundred thousand, one".