21212592352 has 144 divisors (see below), whose sum is σ = 51455295360. Its totient is φ = 8565080832.

The previous prime is 21212592347. The next prime is 21212592353. The reversal of 21212592352 is 25329521212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212592353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2411899 + ... + 2420677.

It is an arithmetic number, because the mean of its divisors is an integer number (357328440).

Almost surely, 2^21212592352 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 21212592352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25727647680).

21212592352 is an abundant number, since it is smaller than the sum of its proper divisors (30242703008).

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

21212592352 is a wasteful number, since it uses less digits than its factorization.

21212592352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8893 (or 8878 counting only the distinct ones).

The product of its digits is 21600, while the sum is 34.

The spelling of 21212592352 in words is "twenty-one billion, two hundred twelve million, five hundred ninety-two thousand, three hundred fifty-two".