21536072757771 has 32 divisors (see below), whose sum is σ = 33921207640320. Its totient is φ = 11981588169600.

The previous prime is 21536072757763. The next prime is 21536072757799. The reversal of 21536072757771 is 17775727063512.

It is not a de Polignac number, because 21536072757771 - 2³ = 21536072757763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21536072757071) 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 in 31 ways as a sum of consecutive naturals, for example, 138598141 + ... + 138753438.

It is an arithmetic number, because the mean of its divisors is an integer number (1060037738760).

Almost surely, 2^{21536072757771} is an apocalyptic number.

21536072757771 is a deficient number, since it is larger than the sum of its proper divisors (12385134882549).

21536072757771 is a wasteful number, since it uses less digits than its factorization.

21536072757771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277351787.

The product of its (nonzero) digits is 30252600, while the sum is 60.

The spelling of 21536072757771 in words is "twenty-one trillion, five hundred thirty-six billion, seventy-two million, seven hundred fifty-seven thousand, seven hundred seventy-one".