21536268601 has 2 divisors, whose sum is σ = 21536268602. Its totient is φ = 21536268600.

The previous prime is 21536268583. The next prime is 21536268613. The reversal of 21536268601 is 10686263512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18197740201 + 3338528400 = 134899^2 + 57780^2 .

It is a cyclic number.

It is not a de Polignac number, because 21536268601 - 2¹³ = 21536260409 is a prime.

It is not a weakly prime, because it can be changed into another prime (21536268631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10768134300 + 10768134301.

It is an arithmetic number, because the mean of its divisors is an integer number (10768134301).

Almost surely, 2^21536268601 is an apocalyptic number.

It is an amenable number.

21536268601 is a deficient number, since it is larger than the sum of its proper divisors (1).

21536268601 is an equidigital number, since it uses as much as digits as its factorization.

21536268601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 21536268601 in words is "twenty-one billion, five hundred thirty-six million, two hundred sixty-eight thousand, six hundred one".