21354612716803 has 2 divisors, whose sum is σ = 21354612716804. Its totient is φ = 21354612716802.

The previous prime is 21354612716761. The next prime is 21354612716809. The reversal of 21354612716803 is 30861721645312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21354612716803 - 2¹⁷ = 21354612585731 is a prime.

It is not a weakly prime, because it can be changed into another prime (21354612716809) 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, 10677306358401 + 10677306358402.

It is an arithmetic number, because the mean of its divisors is an integer number (10677306358402).

Almost surely, 2^{21354612716803} is an apocalyptic number.

21354612716803 is a deficient number, since it is larger than the sum of its proper divisors (1).

21354612716803 is an equidigital number, since it uses as much as digits as its factorization.

21354612716803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 21354612716803 in words is "twenty-one trillion, three hundred fifty-four billion, six hundred twelve million, seven hundred sixteen thousand, eight hundred three".