21436164601 has 2 divisors, whose sum is σ = 21436164602. Its totient is φ = 21436164600.

The previous prime is 21436164599. The next prime is 21436164613. The reversal of 21436164601 is 10646163412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21000357225 + 435807376 = 144915^2 + 20876^2 .

It is a cyclic number.

It is not a de Polignac number, because 21436164601 - 2¹ = 21436164599 is a prime.

Together with 21436164599, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21436164641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10718082300 + 10718082301.

It is an arithmetic number, because the mean of its divisors is an integer number (10718082301).

Almost surely, 2^21436164601 is an apocalyptic number.

It is an amenable number.

21436164601 is a deficient number, since it is larger than the sum of its proper divisors (1).

21436164601 is an equidigital number, since it uses as much as digits as its factorization.

21436164601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 21436164601 in words is "twenty-one billion, four hundred thirty-six million, one hundred sixty-four thousand, six hundred one".