21286196329 has 2 divisors, whose sum is σ = 21286196330. Its totient is φ = 21286196328.

The previous prime is 21286196293. The next prime is 21286196333. The reversal of 21286196329 is 92369168212.

Together with previous prime (21286196293) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12466169104 + 8820027225 = 111652^2 + 93915^2 .

It is a cyclic number.

It is not a de Polignac number, because 21286196329 - 2⁷ = 21286196201 is a prime.

It is not a weakly prime, because it can be changed into another prime (21286196339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10643098164 + 10643098165.

It is an arithmetic number, because the mean of its divisors is an integer number (10643098165).

Almost surely, 2^21286196329 is an apocalyptic number.

It is an amenable number.

21286196329 is a deficient number, since it is larger than the sum of its proper divisors (1).

21286196329 is an equidigital number, since it uses as much as digits as its factorization.

21286196329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 49.

The spelling of 21286196329 in words is "twenty-one billion, two hundred eighty-six million, one hundred ninety-six thousand, three hundred twenty-nine".