21126515869828 has 24 divisors (see below), whose sum is σ = 36996323785344. Its totient is φ = 10556138304000.

The previous prime is 21126515869807. The next prime is 21126515869831. The reversal of 21126515869828 is 82896851562112.

It is a self number, because there is not a number n which added to its sum of digits gives 21126515869828.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151519401 + ... + 151658767.

It is an arithmetic number, because the mean of its divisors is an integer number (1541513491056).

Almost surely, 2^{21126515869828} is an apocalyptic number.

It is an amenable number.

21126515869828 is a deficient number, since it is larger than the sum of its proper divisors (15869807915516).

21126515869828 is a wasteful number, since it uses less digits than its factorization.

21126515869828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164643 (or 164641 counting only the distinct ones).

The product of its digits is 33177600, while the sum is 64.

The spelling of 21126515869828 in words is "twenty-one trillion, one hundred twenty-six billion, five hundred fifteen million, eight hundred sixty-nine thousand, eight hundred twenty-eight".