21836446727 has 2 divisors, whose sum is σ = 21836446728. Its totient is φ = 21836446726.

The previous prime is 21836446699. The next prime is 21836446733. The reversal of 21836446727 is 72764463812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21836446727 - 2¹² = 21836442631 is a prime.

It is a super-2 number, since 2×21836446727² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21836446747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10918223363 + 10918223364.

It is an arithmetic number, because the mean of its divisors is an integer number (10918223364).

Almost surely, 2^21836446727 is an apocalyptic number.

21836446727 is a deficient number, since it is larger than the sum of its proper divisors (1).

21836446727 is an equidigital number, since it uses as much as digits as its factorization.

21836446727 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2709504, while the sum is 50.

The spelling of 21836446727 in words is "twenty-one billion, eight hundred thirty-six million, four hundred forty-six thousand, seven hundred twenty-seven".