21524701086 has 144 divisors (see below), whose sum is σ = 56350915920. Its totient is φ = 5915669760.

The previous prime is 21524701067. The next prime is 21524701091. The reversal of 21524701086 is 68010742512.

21524701086 is a `hidden beast` number, since 21 + 524 + 7 + 0 + 108 + 6 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21524701086.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2900721 + ... + 2908131.

It is an arithmetic number, because the mean of its divisors is an integer number (391325805).

Almost surely, 2^21524701086 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21524701086, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28175457960).

21524701086 is an abundant number, since it is smaller than the sum of its proper divisors (34826214834).

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

21524701086 is a wasteful number, since it uses less digits than its factorization.

21524701086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7559 (or 7549 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The spelling of 21524701086 in words is "twenty-one billion, five hundred twenty-four million, seven hundred one thousand, eighty-six".