21510453132 has 144 divisors (see below), whose sum is σ = 62741952000. Its totient is φ = 6086707200.

The previous prime is 21510453131. The next prime is 21510453137. The reversal of 21510453132 is 23135401512.

21510453132 is a `hidden beast` number, since 21 + 5 + 104 + 531 + 3 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21510453096 and 21510453105.

It is not an unprimeable number, because it can be changed into a prime (21510453131) 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 47 ways as a sum of consecutive naturals, for example, 17084719 + ... + 17085977.

It is an arithmetic number, because the mean of its divisors is an integer number (435708000).

Almost surely, 2^21510453132 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 21510453132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31370976000).

21510453132 is an abundant number, since it is smaller than the sum of its proper divisors (41231498868).

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

21510453132 is a wasteful number, since it uses less digits than its factorization.

21510453132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1876 (or 1871 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 21510453132 its reverse (23135401512), we get a palindrome (44645854644).

The spelling of 21510453132 in words is "twenty-one billion, five hundred ten million, four hundred fifty-three thousand, one hundred thirty-two".