21620536176671 has 2 divisors, whose sum is σ = 21620536176672. Its totient is φ = 21620536176670.

The previous prime is 21620536176637. The next prime is 21620536176689. The reversal of 21620536176671 is 17667163502612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21620536176671 - 2¹⁴ = 21620536160287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21620536176871) 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 as a sum of consecutive naturals, namely, 10810268088335 + 10810268088336.

It is an arithmetic number, because the mean of its divisors is an integer number (10810268088336).

Almost surely, 2^{21620536176671} is an apocalyptic number.

21620536176671 is a deficient number, since it is larger than the sum of its proper divisors (1).

21620536176671 is an equidigital number, since it uses as much as digits as its factorization.

21620536176671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3810240, while the sum is 53.

The spelling of 21620536176671 in words is "twenty-one trillion, six hundred twenty billion, five hundred thirty-six million, one hundred seventy-six thousand, six hundred seventy-one".