21147066689528 has 32 divisors (see below), whose sum is σ = 45212619962160. Its totient is φ = 9186056117760.

The previous prime is 21147066689521. The next prime is 21147066689537. The reversal of 21147066689528 is 82598666074112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21147066689521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5980503518 + ... + 5980507053.

Almost surely, 2^{21147066689528} is an apocalyptic number.

It is an amenable number.

21147066689528 is an abundant number, since it is smaller than the sum of its proper divisors (24065553272632).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21147066689528 is a wasteful number, since it uses less digits than its factorization.

21147066689528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11961010607 (or 11961010603 counting only the distinct ones).

The product of its (nonzero) digits is 69672960, while the sum is 65.

The spelling of 21147066689528 in words is "twenty-one trillion, one hundred forty-seven billion, sixty-six million, six hundred eighty-nine thousand, five hundred twenty-eight".