21470740713677 has 2 divisors, whose sum is σ = 21470740713678. Its totient is φ = 21470740713676.

The previous prime is 21470740713599. The next prime is 21470740713767. The reversal of 21470740713677 is 77631704707412.

Together with next prime (21470740713767) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10736277943876 + 10734462769801 = 3276626^2 + 3276349^2 .

It is a cyclic number.

It is not a de Polignac number, because 21470740713677 - 2¹⁰ = 21470740712653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21470740712677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10735370356838 + 10735370356839.

It is an arithmetic number, because the mean of its divisors is an integer number (10735370356839).

Almost surely, 2^{21470740713677} is an apocalyptic number.

It is an amenable number.

21470740713677 is a deficient number, since it is larger than the sum of its proper divisors (1).

21470740713677 is an equidigital number, since it uses as much as digits as its factorization.

21470740713677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9680832, while the sum is 56.

The spelling of 21470740713677 in words is "twenty-one trillion, four hundred seventy billion, seven hundred forty million, seven hundred thirteen thousand, six hundred seventy-seven".