21529353188 has 48 divisors (see below), whose sum is σ = 45470113920. Its totient is φ = 8713246464.

The previous prime is 21529353179. The next prime is 21529353193. The reversal of 21529353188 is 88135392512.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101870 + ... + 231162.

It is an arithmetic number, because the mean of its divisors is an integer number (947294040).

Almost surely, 2^21529353188 is an apocalyptic number.

21529353188 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21529353188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22735056960).

21529353188 is an abundant number, since it is smaller than the sum of its proper divisors (23940760732).

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

21529353188 is a wasteful number, since it uses less digits than its factorization.

21529353188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129636 (or 129634 counting only the distinct ones).

The product of its digits is 518400, while the sum is 47.

The spelling of 21529353188 in words is "twenty-one billion, five hundred twenty-nine million, three hundred fifty-three thousand, one hundred eighty-eight".