21356465312 has 96 divisors (see below), whose sum is σ = 52952118912. Its totient is φ = 8252181504.

The previous prime is 21356465309. The next prime is 21356465327.

21356465312 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21356465312² (a number of 21 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 39938 + ... + 210494.

It is an arithmetic number, because the mean of its divisors is an integer number (551584572).

Almost surely, 2^21356465312 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 21356465312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26476059456).

21356465312 is an abundant number, since it is smaller than the sum of its proper divisors (31595653600).

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

21356465312 is a wasteful number, since it uses less digits than its factorization.

21356465312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170630 (or 170622 counting only the distinct ones).

The product of its digits is 129600, while the sum is 38.

The spelling of 21356465312 in words is "twenty-one billion, three hundred fifty-six million, four hundred sixty-five thousand, three hundred twelve".