21234201216 has 64 divisors (see below), whose sum is σ = 56961900000. Its totient is φ = 7007974400.

The previous prime is 21234201193. The next prime is 21234201221. The reversal of 21234201216 is 61210243212.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234966 + ... + 312533.

Almost surely, 2^21234201216 is an apocalyptic number.

It is an amenable number.

21234201216 is an abundant number, since it is smaller than the sum of its proper divisors (35727698784).

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

21234201216 is a wasteful number, since it uses less digits than its factorization.

21234201216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547617 (or 547605 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21234201216 its reverse (61210243212), we get a palindrome (82444444428).

The spelling of 21234201216 in words is "twenty-one billion, two hundred thirty-four million, two hundred one thousand, two hundred sixteen".