21282020552 has 128 divisors (see below), whose sum is σ = 45702558720. Its totient is φ = 9220608000.

The previous prime is 21282020549. The next prime is 21282020569. The reversal of 21282020552 is 25502028212.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30798527 + ... + 30799217.

It is an arithmetic number, because the mean of its divisors is an integer number (357051240).

Almost surely, 2^21282020552 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 21282020552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22851279360).

21282020552 is an abundant number, since it is smaller than the sum of its proper divisors (24420538168).

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

21282020552 is a wasteful number, since it uses less digits than its factorization.

21282020552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015 (or 1011 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 29.

Adding to 21282020552 its reverse (25502028212), we get a palindrome (46784048764).

The spelling of 21282020552 in words is "twenty-one billion, two hundred eighty-two million, twenty thousand, five hundred fifty-two".