21231230130 has 192 divisors, whose sum is σ = 64059061248. Its totient is φ = 4821626880.

The previous prime is 21231230101. The next prime is 21231230213. The reversal of 21231230130 is 3103213212.

21231230130 is a `hidden beast` number, since 21 + 2 + 312 + 301 + 30 = 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 polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3750262 + ... + 3755918.

It is an arithmetic number, because the mean of its divisors is an integer number (333640944).

Almost surely, 2^21231230130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21231230130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32029530624).

21231230130 is an abundant number, since it is smaller than the sum of its proper divisors (42827831118).

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

21231230130 is a wasteful number, since it uses less digits than its factorization.

21231230130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5921 (or 5918 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21231230130 its reverse (3103213212), we get a palindrome (24334443342).

The spelling of 21231230130 in words is "twenty-one billion, two hundred thirty-one million, two hundred thirty thousand, one hundred thirty".