21750716773729 has 16 divisors (see below), whose sum is σ = 22789934876160. Its totient is φ = 20732665726080.

The previous prime is 21750716773579. The next prime is 21750716773733. The reversal of 21750716773729 is 92737761705712.

It is a cyclic number.

It is not a de Polignac number, because 21750716773729 - 2²⁹ = 21750179902817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21750716773759) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18738117 + ... + 19865005.

It is an arithmetic number, because the mean of its divisors is an integer number (1424370929760).

Almost surely, 2^{21750716773729} is an apocalyptic number.

It is an amenable number.

21750716773729 is a deficient number, since it is larger than the sum of its proper divisors (1039218102431).

21750716773729 is a wasteful number, since it uses less digits than its factorization.

21750716773729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136280.

The product of its (nonzero) digits is 54454680, while the sum is 64.

The spelling of 21750716773729 in words is "twenty-one trillion, seven hundred fifty billion, seven hundred sixteen million, seven hundred seventy-three thousand, seven hundred twenty-nine".