21216532164203 has 4 divisors (see below), whose sum is σ = 21414817511640. Its totient is φ = 21018246816768.

The previous prime is 21216532164187. The next prime is 21216532164227. The reversal of 21216532164203 is 30246123561212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21216532164203 - 2⁴ = 21216532164187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21216532164703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99142673558 + ... + 99142673771.

It is an arithmetic number, because the mean of its divisors is an integer number (5353704377910).

Almost surely, 2^{21216532164203} is an apocalyptic number.

21216532164203 is a deficient number, since it is larger than the sum of its proper divisors (198285347437).

21216532164203 is a wasteful number, since it uses less digits than its factorization.

21216532164203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198285347436.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 21216532164203 in words is "twenty-one trillion, two hundred sixteen billion, five hundred thirty-two million, one hundred sixty-four thousand, two hundred three".