21001112005000 has 40 divisors (see below), whose sum is σ = 49205605439430. Its totient is φ = 8400444800000.

The previous prime is 21001112004997. The next prime is 21001112005001. The reversal of 21001112005000 is 50021110012.

It can be written as a sum of positive squares in 5 ways, for example, as 3586198163076 + 17414913841924 = 1893726^2 + 4173118^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (21001112005001) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2100106201 + ... + 2100116200.

Almost surely, 2^{21001112005000} is an apocalyptic number.

21001112005000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001112005000 is an abundant number, since it is smaller than the sum of its proper divisors (28204493434430).

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

21001112005000 is an equidigital number, since it uses as much as digits as its factorization.

21001112005000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4200222427 (or 4200222408 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 13.

Adding to 21001112005000 its reverse (50021110012), we get a palindrome (21051133115012).

The spelling of 21001112005000 in words is "twenty-one trillion, one billion, one hundred twelve million, five thousand".