21529723248 has 180 divisors, whose sum is σ = 66566098872. Its totient is φ = 6442287360.

The previous prime is 21529723181. The next prime is 21529723249. The reversal of 21529723248 is 84232792512.

21529723248 is a `hidden beast` number, since 21 + 529 + 72 + 32 + 4 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21529723249) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 10911190 + ... + 10913162.

Almost surely, 2^21529723248 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 21529723248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33283049436).

21529723248 is an abundant number, since it is smaller than the sum of its proper divisors (45036375624).

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

21529723248 is a wasteful number, since it uses less digits than its factorization.

21529723248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2164 (or 2072 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The spelling of 21529723248 in words is "twenty-one billion, five hundred twenty-nine million, seven hundred twenty-three thousand, two hundred forty-eight".