21506776712363 has 2 divisors, whose sum is σ = 21506776712364. Its totient is φ = 21506776712362.

The previous prime is 21506776712339. The next prime is 21506776712401. The reversal of 21506776712363 is 36321767760512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21506776712363 - 2¹⁸ = 21506776450219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21506776712299 and 21506776712308.

It is not a weakly prime, because it can be changed into another prime (21506776712263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10753388356181 + 10753388356182.

It is an arithmetic number, because the mean of its divisors is an integer number (10753388356182).

Almost surely, 2^{21506776712363} is an apocalyptic number.

21506776712363 is a deficient number, since it is larger than the sum of its proper divisors (1).

21506776712363 is an equidigital number, since it uses as much as digits as its factorization.

21506776712363 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13335840, while the sum is 56.

The spelling of 21506776712363 in words is "twenty-one trillion, five hundred six billion, seven hundred seventy-six million, seven hundred twelve thousand, three hundred sixty-three".