21113330355216 has 120 divisors (see below), whose sum is σ = 64554017894496. Its totient is φ = 6388611102720.

The previous prime is 21113330355209. The next prime is 21113330355233. The reversal of 21113330355216 is 61255303331112.

21113330355216 is a `hidden beast` number, since 2 + 1 + 1 + 133 + 303 + 5 + 5 + 216 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8675905 + ... + 10839648.

Almost surely, 2^{21113330355216} is an apocalyptic number.

It is an amenable number.

21113330355216 is an abundant number, since it is smaller than the sum of its proper divisors (43440687539280).

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

21113330355216 is a wasteful number, since it uses less digits than its factorization.

21113330355216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19516261 (or 19516252 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

Adding to 21113330355216 its reverse (61255303331112), we get a palindrome (82368633686328).

The spelling of 21113330355216 in words is "twenty-one trillion, one hundred thirteen billion, three hundred thirty million, three hundred fifty-five thousand, two hundred sixteen".