21152516152120 has 16 divisors (see below), whose sum is σ = 47593161342360. Its totient is φ = 8461006460832.

The previous prime is 21152516152099. The next prime is 21152516152129. The reversal of 21152516152120 is 2125161525112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152516152129) 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 3 ways as a sum of consecutive naturals, for example, 264406451862 + ... + 264406451941.

Almost surely, 2^{21152516152120} is an apocalyptic number.

21152516152120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21152516152120 is an abundant number, since it is smaller than the sum of its proper divisors (26440645190240).

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

21152516152120 is a wasteful number, since it uses less digits than its factorization.

21152516152120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528812903814 (or 528812903810 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 34.

Adding to 21152516152120 its reverse (2125161525112), we get a palindrome (23277677677232).

The spelling of 21152516152120 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred sixteen million, one hundred fifty-two thousand, one hundred twenty".