21123122130 has 192 divisors, whose sum is σ = 63190108800. Its totient is φ = 4841717760.

The previous prime is 21123122129. The next prime is 21123122159. The reversal of 21123122130 is 3122132112.

21123122130 is a `hidden beast` number, since 211 + 231 + 221 + 3 + 0 = 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, 14990866 + ... + 14992274.

It is an arithmetic number, because the mean of its divisors is an integer number (329115150).

Almost surely, 2^21123122130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21123122130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31595054400).

21123122130 is an abundant number, since it is smaller than the sum of its proper divisors (42066986670).

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

21123122130 is a wasteful number, since it uses less digits than its factorization.

21123122130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2249 (or 2246 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21123122130 its reverse (3122132112), we get a palindrome (24245254242).

The spelling of 21123122130 in words is "twenty-one billion, one hundred twenty-three million, one hundred twenty-two thousand, one hundred thirty".