16520921812844 has 24 divisors (see below), whose sum is σ = 30434802019440. Its totient is φ = 7825307664384.

The previous prime is 16520921812757. The next prime is 16520921812847. The reversal of 16520921812844 is 44821812902561.

It is a super-2 number, since 2×16520921812844² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16520921812847) 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 7 ways as a sum of consecutive naturals, for example, 3916949 + ... + 6955884.

It is an arithmetic number, because the mean of its divisors is an integer number (1268116750810).

Almost surely, 2^{16520921812844} is an apocalyptic number.

It is an amenable number.

16520921812844 is a deficient number, since it is larger than the sum of its proper divisors (13913880206596).

16520921812844 is a wasteful number, since it uses less digits than its factorization.

16520921812844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10892849 (or 10892847 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 53.

The spelling of 16520921812844 in words is "sixteen trillion, five hundred twenty billion, nine hundred twenty-one million, eight hundred twelve thousand, eight hundred forty-four".