21130320132 has 72 divisors (see below), whose sum is σ = 54184009880. Its totient is φ = 6942412800.

The previous prime is 21130320061. The next prime is 21130320143. The reversal of 21130320132 is 23102303112.

21130320132 is a `hidden beast` number, since 211 + 3 + 0 + 320 + 132 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6638012676 + 14492307456 = 81474^2 + 120384^2 .

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

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 743382 + ... + 771282.

Almost surely, 2^21130320132 is an apocalyptic number.

It is an amenable number.

21130320132 is an abundant number, since it is smaller than the sum of its proper divisors (33053689748).

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

21130320132 is a wasteful number, since it uses less digits than its factorization.

21130320132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28213 (or 28208 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21130320132 its reverse (23102303112), we get a palindrome (44232623244).

The spelling of 21130320132 in words is "twenty-one billion, one hundred thirty million, three hundred twenty thousand, one hundred thirty-two".