21043541216 has 24 divisors (see below), whose sum is σ = 41438300904. Its totient is φ = 10519528320.

The previous prime is 21043541213. The next prime is 21043541231. The reversal of 21043541216 is 61214534012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21043541213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87911 + ... + 223193.

It is an arithmetic number, because the mean of its divisors is an integer number (1726595871).

Almost surely, 2^21043541216 is an apocalyptic number.

It is an amenable number.

21043541216 is a deficient number, since it is larger than the sum of its proper divisors (20394759688).

21043541216 is a wasteful number, since it uses less digits than its factorization.

21043541216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140154 (or 140146 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The spelling of 21043541216 in words is "twenty-one billion, forty-three million, five hundred forty-one thousand, two hundred sixteen".