21346086649 has 2 divisors, whose sum is σ = 21346086650. Its totient is φ = 21346086648.

The previous prime is 21346086647. The next prime is 21346086673. The reversal of 21346086649 is 94668064312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18924954624 + 2421132025 = 137568^2 + 49205^2 .

It is a cyclic number.

It is not a de Polignac number, because 21346086649 - 2¹ = 21346086647 is a prime.

Together with 21346086647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21346086647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10673043324 + 10673043325.

It is an arithmetic number, because the mean of its divisors is an integer number (10673043325).

Almost surely, 2^21346086649 is an apocalyptic number.

It is an amenable number.

21346086649 is a deficient number, since it is larger than the sum of its proper divisors (1).

21346086649 is an equidigital number, since it uses as much as digits as its factorization.

21346086649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1492992, while the sum is 49.

The spelling of 21346086649 in words is "twenty-one billion, three hundred forty-six million, eighty-six thousand, six hundred forty-nine".