21312112031130 has 128 divisors (see below), whose sum is σ = 54818467200000. Its totient is φ = 5283693999104.

The previous prime is 21312112031071. The next prime is 21312112031131. The reversal of 21312112031130 is 3113021121312.

It is a super-2 number, since 2×21312112031130² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21312112031097 and 21312112031106.

It is not an unprimeable number, because it can be changed into a prime (21312112031131) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 317399101 + ... + 317466239.

It is an arithmetic number, because the mean of its divisors is an integer number (428269275000).

Almost surely, 2^{21312112031130} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21312112031130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27409233600000).

21312112031130 is an abundant number, since it is smaller than the sum of its proper divisors (33506355168870).

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

21312112031130 is a wasteful number, since it uses less digits than its factorization.

21312112031130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74748.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 21312112031130 its reverse (3113021121312), we get a palindrome (24425133152442).

The spelling of 21312112031130 in words is "twenty-one trillion, three hundred twelve billion, one hundred twelve million, thirty-one thousand, one hundred thirty".