21352013312 has 80 divisors (see below), whose sum is σ = 48836121312. Its totient is φ = 9136005120.

The previous prime is 21352013281. The next prime is 21352013327. The reversal of 21352013312 is 21331025312.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2364518 + ... + 2373530.

Almost surely, 2^21352013312 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 21352013312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24418060656).

21352013312 is an abundant number, since it is smaller than the sum of its proper divisors (27484108000).

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

21352013312 is an frugal number, since it uses more digits than its factorization.

21352013312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9699 (or 9683 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

Adding to 21352013312 its reverse (21331025312), we get a palindrome (42683038624).

The spelling of 21352013312 in words is "twenty-one billion, three hundred fifty-two million, thirteen thousand, three hundred twelve".