21042365130 has 48 divisors (see below), whose sum is σ = 54754245000. Its totient is φ = 5606774784.

The previous prime is 21042365063. The next prime is 21042365131. The reversal of 21042365130 is 3156324012.

21042365130 is a `hidden beast` number, since 2 + 1 + 0 + 4 + 2 + 3 + 651 + 3 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 15748493049 + 5293872081 = 125493^2 + 72759^2 .

It is a super-2 number, since 2×21042365130² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21042365094 and 21042365103.

It is not an unprimeable number, because it can be changed into a prime (21042365131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18814 + ... + 206006.

Almost surely, 2^21042365130 is an apocalyptic number.

21042365130 is an abundant number, since it is smaller than the sum of its proper divisors (33711879870).

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

21042365130 is a wasteful number, since it uses less digits than its factorization.

21042365130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188455 (or 188452 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 21042365130 its reverse (3156324012), we get a palindrome (24198689142).

The spelling of 21042365130 in words is "twenty-one billion, forty-two million, three hundred sixty-five thousand, one hundred thirty".