21134131830 has 192 divisors, whose sum is σ = 64975188096. Its totient is φ = 4665600000.

The previous prime is 21134131819. The next prime is 21134131897. The reversal of 21134131830 is 3813143112.

21134131830 is a `hidden beast` number, since 2 + 1 + 1 + 341 + 318 + 3 + 0 = 666.

21134131830 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 21134131794 and 21134131803.

It is a congruent number.

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, 2604780 + ... + 2612880.

It is an arithmetic number, because the mean of its divisors is an integer number (338412438).

Almost surely, 2^21134131830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21134131830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32487594048).

21134131830 is an abundant number, since it is smaller than the sum of its proper divisors (43841056266).

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

21134131830 is a wasteful number, since it uses less digits than its factorization.

21134131830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8263 (or 8260 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

Adding to 21134131830 its reverse (3813143112), we get a palindrome (24947274942).

The spelling of 21134131830 in words is "twenty-one billion, one hundred thirty-four million, one hundred thirty-one thousand, eight hundred thirty".