21001968556132 has 24 divisors (see below), whose sum is σ = 37796344135200. Its totient is φ = 10207012702656.

The previous prime is 21001968556013. The next prime is 21001968556159. The reversal of 21001968556132 is 23165586910012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 499930638 + ... + 499972645.

It is an arithmetic number, because the mean of its divisors is an integer number (1574847672300).

Almost surely, 2^{21001968556132} is an apocalyptic number.

It is an amenable number.

21001968556132 is a deficient number, since it is larger than the sum of its proper divisors (16794375579068).

21001968556132 is a wasteful number, since it uses less digits than its factorization.

21001968556132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999903435 (or 999903433 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 49.

The spelling of 21001968556132 in words is "twenty-one trillion, one billion, nine hundred sixty-eight million, five hundred fifty-six thousand, one hundred thirty-two".