21102124230 has 192 divisors, whose sum is σ = 60703568640. Its totient is φ = 5043513600.

The previous prime is 21102124213. The next prime is 21102124231. The reversal of 21102124230 is 3242120112.

It is a happy number.

21102124230 is a `hidden beast` number, since 21 + 10 + 212 + 423 + 0 = 666.

21102124230 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102124231) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 30538185 + ... + 30538875.

It is an arithmetic number, because the mean of its divisors is an integer number (316164420).

Almost surely, 2^21102124230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21102124230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30351784320).

21102124230 is an abundant number, since it is smaller than the sum of its proper divisors (39601444410).

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

21102124230 is a wasteful number, since it uses less digits than its factorization.

21102124230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107 (or 1104 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21102124230 its reverse (3242120112), we get a palindrome (24344244342).

The spelling of 21102124230 in words is "twenty-one billion, one hundred two million, one hundred twenty-four thousand, two hundred thirty".