21312311130 has 96 divisors (see below), whose sum is σ = 61128924480. Its totient is φ = 5108547840.

The previous prime is 21312311123. The next prime is 21312311161. The reversal of 21312311130 is 3111321312.

21312311130 is a `hidden beast` number, since 213 + 12 + 311 + 130 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32832 + ... + 209051.

It is an arithmetic number, because the mean of its divisors is an integer number (636759630).

Almost surely, 2^21312311130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21312311130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30564462240).

21312311130 is an abundant number, since it is smaller than the sum of its proper divisors (39816613350).

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

21312311130 is a wasteful number, since it uses less digits than its factorization.

21312311130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241996 (or 241993 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21312311130 its reverse (3111321312), we get a palindrome (24423632442).

The spelling of 21312311130 in words is "twenty-one billion, three hundred twelve million, three hundred eleven thousand, one hundred thirty".