21130013124 has 72 divisors (see below), whose sum is σ = 58589731200. Its totient is φ = 6367636800.

The previous prime is 21130013081. The next prime is 21130013141. The reversal of 21130013124 is 42131003112.

21130013124 is a `hidden beast` number, since 211 + 300 + 131 + 24 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 21130013097 and 21130013106.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75724 + ... + 219075.

Almost surely, 2^21130013124 is an apocalyptic number.

It is an amenable number.

21130013124 is an abundant number, since it is smaller than the sum of its proper divisors (37459718076).

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

21130013124 is a wasteful number, since it uses less digits than its factorization.

21130013124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295001 (or 294996 counting only the distinct ones).

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

Adding to 21130013124 its reverse (42131003112), we get a palindrome (63261016236).

The spelling of 21130013124 in words is "twenty-one billion, one hundred thirty million, thirteen thousand, one hundred twenty-four".