21243460216 has 32 divisors (see below), whose sum is σ = 44512357680. Its totient is φ = 9420601600.

The previous prime is 21243460213. The next prime is 21243460223. The reversal of 21243460216 is 61206434212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243460213) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2940331 + ... + 2947546.

Almost surely, 2^21243460216 is an apocalyptic number.

It is an amenable number.

21243460216 is an abundant number, since it is smaller than the sum of its proper divisors (23268897464).

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

21243460216 is a wasteful number, since it uses less digits than its factorization.

21243460216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5887935 (or 5887931 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 21243460216 its reverse (61206434212), we get a palindrome (82449894428).

The spelling of 21243460216 in words is "twenty-one billion, two hundred forty-three million, four hundred sixty thousand, two hundred sixteen".