21357699966683 has 2 divisors, whose sum is σ = 21357699966684. Its totient is φ = 21357699966682.

The previous prime is 21357699966643. The next prime is 21357699966751. The reversal of 21357699966683 is 38666999675312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21357699966683 - 2¹⁶ = 21357699901147 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21357699966598 and 21357699966607.

It is not a weakly prime, because it can be changed into another prime (21357699966643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10678849983341 + 10678849983342.

It is an arithmetic number, because the mean of its divisors is an integer number (10678849983342).

Almost surely, 2^{21357699966683} is an apocalyptic number.

21357699966683 is a deficient number, since it is larger than the sum of its proper divisors (1).

21357699966683 is an equidigital number, since it uses as much as digits as its factorization.

21357699966683 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4761711360, while the sum is 80.

The spelling of 21357699966683 in words is "twenty-one trillion, three hundred fifty-seven billion, six hundred ninety-nine million, nine hundred sixty-six thousand, six hundred eighty-three".