21354245535013 has 4 divisors (see below), whose sum is σ = 21354258673260. Its totient is φ = 21354232396768.

The previous prime is 21354245534969. The next prime is 21354245535043. The reversal of 21354245535013 is 31053554245312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4187335504804 + 17166910030209 = 2046298^2 + 4143297^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21354245535013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21354245535043) 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 in 3 ways as a sum of consecutive naturals, for example, 3718870 + ... + 7519207.

It is an arithmetic number, because the mean of its divisors is an integer number (5338564668315).

Almost surely, 2^{21354245535013} is an apocalyptic number.

It is an amenable number.

21354245535013 is a deficient number, since it is larger than the sum of its proper divisors (13138247).

21354245535013 is a wasteful number, since it uses less digits than its factorization.

21354245535013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13138246.

The product of its (nonzero) digits is 1080000, while the sum is 43.

The spelling of 21354245535013 in words is "twenty-one trillion, three hundred fifty-four billion, two hundred forty-five million, five hundred thirty-five thousand, thirteen".