21311132130 has 128 divisors (see below), whose sum is σ = 57422684160. Its totient is φ = 5623914240.

The previous prime is 21311132077. The next prime is 21311132137. The reversal of 21311132130 is 3123111312.

21311132130 is a `hidden beast` number, since 2 + 1 + 311 + 1 + 321 + 30 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (21311132137) 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, 25957120 + ... + 25957940.

It is an arithmetic number, because the mean of its divisors is an integer number (448614720).

Almost surely, 2^21311132130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21311132130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28711342080).

21311132130 is an abundant number, since it is smaller than the sum of its proper divisors (36111552030).

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

21311132130 is a wasteful number, since it uses less digits than its factorization.

21311132130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1721 (or 1715 counting only the distinct ones).

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

Adding to 21311132130 its reverse (3123111312), we get a palindrome (24434243442).

The spelling of 21311132130 in words is "twenty-one billion, three hundred eleven million, one hundred thirty-two thousand, one hundred thirty".