21450035215145 has 16 divisors (see below), whose sum is σ = 25784626680720. Its totient is φ = 17130315761664.

The previous prime is 21450035215139. The next prime is 21450035215153. The reversal of 21450035215145 is 54151253005412.

It can be written as a sum of positive squares in 8 ways, for example, as 1057152056041 + 20392883159104 = 1028179^2 + 4515848^2 .

It is a cyclic number.

It is not a de Polignac number, because 21450035215145 - 2⁴ = 21450035215129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21450035215099 and 21450035215108.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 15698597 + ... + 17010173.

It is an arithmetic number, because the mean of its divisors is an integer number (1611539167545).

Almost surely, 2^{21450035215145} is an apocalyptic number.

It is an amenable number.

21450035215145 is a deficient number, since it is larger than the sum of its proper divisors (4334591465575).

21450035215145 is a wasteful number, since it uses less digits than its factorization.

21450035215145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1317244.

The product of its (nonzero) digits is 120000, while the sum is 38.

The spelling of 21450035215145 in words is "twenty-one trillion, four hundred fifty billion, thirty-five million, two hundred fifteen thousand, one hundred forty-five".