21130211025312 has 96 divisors (see below), whose sum is σ = 56116322035200. Its totient is φ = 6960999395328.

The previous prime is 21130211025173. The next prime is 21130211025403. The reversal of 21130211025312 is 21352011203112.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17679889 + ... + 18837167.

It is an arithmetic number, because the mean of its divisors is an integer number (584545021200).

Almost surely, 2^{21130211025312} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21130211025312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28058161017600).

21130211025312 is an abundant number, since it is smaller than the sum of its proper divisors (34986111009888).

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

21130211025312 is a wasteful number, since it uses less digits than its factorization.

21130211025312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1159518 (or 1159510 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

Adding to 21130211025312 its reverse (21352011203112), we get a palindrome (42482222228424).

The spelling of 21130211025312 in words is "twenty-one trillion, one hundred thirty billion, two hundred eleven million, twenty-five thousand, three hundred twelve".