21152225121216 has 112 divisors (see below), whose sum is σ = 66741182467584. Its totient is φ = 5780732322816.

The previous prime is 21152225121211. The next prime is 21152225121257. The reversal of 21152225121216 is 61212152225112.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152225121211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 342105235 + ... + 342167058.

Almost surely, 2^{21152225121216} is an apocalyptic number.

It is an amenable number.

21152225121216 is an abundant number, since it is smaller than the sum of its proper divisors (45588957346368).

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

21152225121216 is a wasteful number, since it uses less digits than its factorization.

21152225121216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684272338 (or 684272328 counting only the distinct ones).

The product of its digits is 9600, while the sum is 33.

Adding to 21152225121216 its reverse (61212152225112), we get a palindrome (82364377346328).

The spelling of 21152225121216 in words is "twenty-one trillion, one hundred fifty-two billion, two hundred twenty-five million, one hundred twenty-one thousand, two hundred sixteen".