21216464306 has 16 divisors (see below), whose sum is σ = 32047977024. Its totient is φ = 10533956304.

The previous prime is 21216464279. The next prime is 21216464309. The reversal of 21216464306 is 60346461212.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21216464309) 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 7 ways as a sum of consecutive naturals, for example, 247505 + ... + 322011.

It is an arithmetic number, because the mean of its divisors is an integer number (2002998564).

Almost surely, 2^21216464306 is an apocalyptic number.

21216464306 is a deficient number, since it is larger than the sum of its proper divisors (10831512718).

21216464306 is a wasteful number, since it uses less digits than its factorization.

21216464306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75505.

The product of its (nonzero) digits is 41472, while the sum is 35.

The spelling of 21216464306 in words is "twenty-one billion, two hundred sixteen million, four hundred sixty-four thousand, three hundred six".