21540000132 has 144 divisors (see below), whose sum is σ = 63386843520. Its totient is φ = 6039899136.

The previous prime is 21540000107. The next prime is 21540000149. The reversal of 21540000132 is 23100004512.

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 (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16606908 + ... + 16608204.

Almost surely, 2^21540000132 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 21540000132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31693421760).

21540000132 is an abundant number, since it is smaller than the sum of its proper divisors (41846843388).

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

21540000132 is a wasteful number, since it uses less digits than its factorization.

21540000132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2490 (or 2485 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 21540000132 its reverse (23100004512), we get a palindrome (44640004644).

The spelling of 21540000132 in words is "twenty-one billion, five hundred forty million, one hundred thirty-two", and thus it is an aban number.