21525510132 has 96 divisors (see below), whose sum is σ = 63817286400. Its totient is φ = 6146482176.

The previous prime is 21525510131. The next prime is 21525510133. The reversal of 21525510132 is 23101552512.

21525510132 is a `hidden beast` number, since 2 + 1 + 525 + 5 + 1 + 0 + 132 = 666.

It is an interprime number because it is at equal distance from previous prime (21525510131) and next prime (21525510133).

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

It is a junction number, because it is equal to n+sod(n) for n = 21525510096 and 21525510105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21525510131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1420548 + ... + 1435620.

It is an arithmetic number, because the mean of its divisors is an integer number (664763400).

Almost surely, 2^21525510132 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 21525510132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31908643200).

21525510132 is an abundant number, since it is smaller than the sum of its proper divisors (42291776268).

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

21525510132 is a wasteful number, since it uses less digits than its factorization.

21525510132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16982 (or 16974 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The spelling of 21525510132 in words is "twenty-one billion, five hundred twenty-five million, five hundred ten thousand, one hundred thirty-two".