21017742573 has 32 divisors (see below), whose sum is σ = 29010263040. Its totient is φ = 13526997120.

The previous prime is 21017742521. The next prime is 21017742619. The reversal of 21017742573 is 37524771012.

It is not a de Polignac number, because 21017742573 - 2¹² = 21017738477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21017742503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4442073 + ... + 4446801.

It is an arithmetic number, because the mean of its divisors is an integer number (906570720).

Almost surely, 2^21017742573 is an apocalyptic number.

It is an amenable number.

21017742573 is a deficient number, since it is larger than the sum of its proper divisors (7992520467).

21017742573 is a wasteful number, since it uses less digits than its factorization.

21017742573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5169.

The product of its (nonzero) digits is 82320, while the sum is 39.

The spelling of 21017742573 in words is "twenty-one billion, seventeen million, seven hundred forty-two thousand, five hundred seventy-three".