21336674641 has 2 divisors, whose sum is σ = 21336674642. Its totient is φ = 21336674640.

The previous prime is 21336674609. The next prime is 21336674747. The reversal of 21336674641 is 14647663312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21229655616 + 107019025 = 145704^2 + 10345^2 .

It is a cyclic number.

It is not a de Polignac number, because 21336674641 - 2⁵ = 21336674609 is a prime.

It is not a weakly prime, because it can be changed into another prime (21336674441) 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, 10668337320 + 10668337321.

It is an arithmetic number, because the mean of its divisors is an integer number (10668337321).

Almost surely, 2^21336674641 is an apocalyptic number.

It is an amenable number.

21336674641 is a deficient number, since it is larger than the sum of its proper divisors (1).

21336674641 is an equidigital number, since it uses as much as digits as its factorization.

21336674641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 43.

The spelling of 21336674641 in words is "twenty-one billion, three hundred thirty-six million, six hundred seventy-four thousand, six hundred forty-one".