21211032130000 has 100 divisors (see below), whose sum is σ = 51437819681908. Its totient is φ = 8470569600000.

The previous prime is 21211032129977. The next prime is 21211032130021. The reversal of 21211032130000 is 3123011212.

It can be written as a sum of positive squares in 10 ways, for example, as 18948992065936 + 2262040064064 = 4353044^2 + 1504008^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4399900 + ... + 7860100.

Almost surely, 2^{21211032130000} is an apocalyptic number.

21211032130000 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 21211032130000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25718909840954).

21211032130000 is an abundant number, since it is smaller than the sum of its proper divisors (30226787551908).

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

21211032130000 is an equidigital number, since it uses as much as digits as its factorization.

21211032130000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3460842 (or 3460821 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21211032130000 its reverse (3123011212), we get a palindrome (21214155141212).

The spelling of 21211032130000 in words is "twenty-one trillion, two hundred eleven billion, thirty-two million, one hundred thirty thousand".