21001910000 has 50 divisors (see below), whose sum is σ = 50847748512. Its totient is φ = 8400760000.

The previous prime is 21001909969. The next prime is 21001910051. The reversal of 21001910000 is 1910012.

It is a tau number, because it is divible by the number of its divisors (50).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1040096 + ... + 1060095.

Almost surely, 2^21001910000 is an apocalyptic number.

21001910000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001910000 is an abundant number, since it is smaller than the sum of its proper divisors (29845838512).

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

21001910000 is an equidigital number, since it uses as much as digits as its factorization.

21001910000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2100219 (or 2100198 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 14.

The spelling of 21001910000 in words is "twenty-one billion, one million, nine hundred ten thousand".