21525532110 has 160 divisors (see below), whose sum is σ = 59983165440. Its totient is φ = 5534972352.

The previous prime is 21525532103. The next prime is 21525532121. The reversal of 21525532110 is 1123552512.

21525532110 is a `hidden beast` number, since 2 + 15 + 2 + 5 + 532 + 110 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2747659 + ... + 2755481.

It is an arithmetic number, because the mean of its divisors is an integer number (374894784).

Almost surely, 2^21525532110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21525532110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29991582720).

21525532110 is an abundant number, since it is smaller than the sum of its proper divisors (38457633330).

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

21525532110 is a wasteful number, since it uses less digits than its factorization.

21525532110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7964 (or 7955 counting only the distinct ones).

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

The spelling of 21525532110 in words is "twenty-one billion, five hundred twenty-five million, five hundred thirty-two thousand, one hundred ten".