21130450452 has 96 divisors (see below), whose sum is σ = 55858185600. Its totient is φ = 6905834496.

The previous prime is 21130450433. The next prime is 21130450459. The reversal of 21130450452 is 25405403112.

21130450452 is a `hidden beast` number, since 21 + 130 + 4 + 504 + 5 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130450459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2525508 + ... + 2533860.

It is an arithmetic number, because the mean of its divisors is an integer number (581856100).

Almost surely, 2^21130450452 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21130450452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27929092800).

21130450452 is an abundant number, since it is smaller than the sum of its proper divisors (34727735148).

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

21130450452 is a wasteful number, since it uses less digits than its factorization.

21130450452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8822 (or 8814 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 21130450452 its reverse (25405403112), we get a palindrome (46535853564).

The spelling of 21130450452 in words is "twenty-one billion, one hundred thirty million, four hundred fifty thousand, four hundred fifty-two".