21716714693 has 2 divisors, whose sum is σ = 21716714694. Its totient is φ = 21716714692.

The previous prime is 21716714681. The next prime is 21716714731. The reversal of 21716714693 is 39641761712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18133854244 + 3582860449 = 134662^2 + 59857^2 .

It is a cyclic number.

It is not a de Polignac number, because 21716714693 - 2¹⁴ = 21716698309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21716714993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10858357346 + 10858357347.

It is an arithmetic number, because the mean of its divisors is an integer number (10858357347).

Almost surely, 2^21716714693 is an apocalyptic number.

It is an amenable number.

21716714693 is a deficient number, since it is larger than the sum of its proper divisors (1).

21716714693 is an equidigital number, since it uses as much as digits as its factorization.

21716714693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 47.

The spelling of 21716714693 in words is "twenty-one billion, seven hundred sixteen million, seven hundred fourteen thousand, six hundred ninety-three".