21001132210000 has 100 divisors (see below), whose sum is σ = 50868129138112. Its totient is φ = 8396770608000.

The previous prime is 21001132209983. The next prime is 21001132210001. The reversal of 21001132210000 is 1223110012.

It is a tau number, because it is divible by the number of its divisors (100).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001132210001) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 22410859 + ... + 23329141.

Almost surely, 2^{21001132210000} is an apocalyptic number.

21001132210000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21001132210000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25434064569056).

21001132210000 is an abundant number, since it is smaller than the sum of its proper divisors (29866996928112).

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

21001132210000 is an equidigital number, since it uses as much as digits as its factorization.

21001132210000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920598 (or 920577 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21001132210000 its reverse (1223110012), we get a palindrome (21002355320012).

The spelling of 21001132210000 in words is "twenty-one trillion, one billion, one hundred thirty-two million, two hundred ten thousand".