21536072757799 has 2 divisors, whose sum is σ = 21536072757800. Its totient is φ = 21536072757798.

The previous prime is 21536072757763. The next prime is 21536072757809. The reversal of 21536072757799 is 99775727063512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21536072757799 - 2³¹ = 21533925274151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21536072757499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10768036378899 + 10768036378900.

It is an arithmetic number, because the mean of its divisors is an integer number (10768036378900).

Almost surely, 2^{21536072757799} is an apocalyptic number.

21536072757799 is a deficient number, since it is larger than the sum of its proper divisors (1).

21536072757799 is an equidigital number, since it uses as much as digits as its factorization.

21536072757799 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 350065800, while the sum is 70.

The spelling of 21536072757799 in words is "twenty-one trillion, five hundred thirty-six billion, seventy-two million, seven hundred fifty-seven thousand, seven hundred ninety-nine".