21200718872 has 32 divisors (see below), whose sum is σ = 40175902800. Its totient is φ = 10487435904.

The previous prime is 21200718841. The next prime is 21200718907. The reversal of 21200718872 is 27881700212.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 577778 + ... + 613374.

Almost surely, 2^21200718872 is an apocalyptic number.

It is an amenable number.

21200718872 is a deficient number, since it is larger than the sum of its proper divisors (18975183928).

21200718872 is a wasteful number, since it uses less digits than its factorization.

21200718872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36395 (or 36391 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 38.

The spelling of 21200718872 in words is "twenty-one billion, two hundred million, seven hundred eighteen thousand, eight hundred seventy-two".