2001721686700 has 36 divisors (see below), whose sum is σ = 4351370166360. Its totient is φ = 799281466240.

The previous prime is 2001721686691. The next prime is 2001721686739. The reversal of 2001721686700 is 76861271002.

It is a super-2 number, since 2×2001721686700² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 17532922 + ... + 17646721.

It is an arithmetic number, because the mean of its divisors is an integer number (120871393510).

Almost surely, 2^{2001721686700} is an apocalyptic number.

2001721686700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001721686700 is an abundant number, since it is smaller than the sum of its proper divisors (2349648479660).

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

2001721686700 is a wasteful number, since it uses less digits than its factorization.

2001721686700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35180226 (or 35180219 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The spelling of 2001721686700 in words is "two trillion, one billion, seven hundred twenty-one million, six hundred eighty-six thousand, seven hundred".