21300415552 has 224 divisors, whose sum is σ = 49680449280. Its totient is φ = 8979210240.

The previous prime is 21300415537. The next prime is 21300415573. The reversal of 21300415552 is 25551400312.

It is a self number, because there is not a number n which added to its sum of digits gives 21300415552.

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, 72697518 + ... + 72697810.

It is an arithmetic number, because the mean of its divisors is an integer number (221787720).

Almost surely, 2^21300415552 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 21300415552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24840224640).

21300415552 is an abundant number, since it is smaller than the sum of its proper divisors (28380033728).

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

21300415552 is a wasteful number, since it uses less digits than its factorization.

21300415552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501 (or 491 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

Adding to 21300415552 its reverse (25551400312), we get a palindrome (46851815864).

The spelling of 21300415552 in words is "twenty-one billion, three hundred million, four hundred fifteen thousand, five hundred fifty-two".