21305534052 has 288 divisors, whose sum is σ = 59786108928. Its totient is φ = 5846400000.

The previous prime is 21305534027. The next prime is 21305534153. The reversal of 21305534052 is 25043550312.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 141096177 + ... + 141096327.

It is an arithmetic number, because the mean of its divisors is an integer number (207590656).

Almost surely, 2^21305534052 is an apocalyptic number.

21305534052 is a gapful number since it is divisible by the number (22) 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 21305534052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29893054464).

21305534052 is an abundant number, since it is smaller than the sum of its proper divisors (38480574876).

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

21305534052 is a wasteful number, since it uses less digits than its factorization.

21305534052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299 (or 268 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 30.

The spelling of 21305534052 in words is "twenty-one billion, three hundred five million, five hundred thirty-four thousand, fifty-two".