21522104352 has 240 divisors, whose sum is σ = 74295587520. Its totient is φ = 5982792192.

The previous prime is 21522104347. The next prime is 21522104353. The reversal of 21522104352 is 25340122512.

21522104352 is a `hidden beast` number, since 2 + 1 + 5 + 221 + 0 + 435 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21522104353) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 655299 + ... + 687357.

It is an arithmetic number, because the mean of its divisors is an integer number (309564948).

Almost surely, 2^21522104352 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 21522104352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37147793760).

21522104352 is an abundant number, since it is smaller than the sum of its proper divisors (52773483168).

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

21522104352 is a wasteful number, since it uses less digits than its factorization.

21522104352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32125 (or 32108 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 21522104352 its reverse (25340122512), we get a palindrome (46862226864).

The spelling of 21522104352 in words is "twenty-one billion, five hundred twenty-two million, one hundred four thousand, three hundred fifty-two".