21383866697 has 2 divisors, whose sum is σ = 21383866698. Its totient is φ = 21383866696.

The previous prime is 21383866657. The next prime is 21383866727. The reversal of 21383866697 is 79666838312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21379118656 + 4748041 = 146216^2 + 2179^2 .

It is a cyclic number.

It is not a de Polignac number, because 21383866697 - 2¹² = 21383862601 is a prime.

It is not a weakly prime, because it can be changed into another prime (21383866627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10691933348 + 10691933349.

It is an arithmetic number, because the mean of its divisors is an integer number (10691933349).

Almost surely, 2^21383866697 is an apocalyptic number.

It is an amenable number.

21383866697 is a deficient number, since it is larger than the sum of its proper divisors (1).

21383866697 is an equidigital number, since it uses as much as digits as its factorization.

21383866697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15676416, while the sum is 59.

The spelling of 21383866697 in words is "twenty-one billion, three hundred eighty-three million, eight hundred sixty-six thousand, six hundred ninety-seven".