16540516221 has 16 divisors (see below), whose sum is σ = 22214320128. Its totient is φ = 10947150000.

The previous prime is 16540516211. The next prime is 16540516229. The reversal of 16540516221 is 12261504561.

It is not a de Polignac number, because 16540516221 - 2⁷ = 16540516093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16540516229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195396 + ... + 266946.

It is an arithmetic number, because the mean of its divisors is an integer number (1388395008).

Almost surely, 2^16540516221 is an apocalyptic number.

It is an amenable number.

16540516221 is a deficient number, since it is larger than the sum of its proper divisors (5673803907).

16540516221 is a wasteful number, since it uses less digits than its factorization.

16540516221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72112.

The product of its (nonzero) digits is 14400, while the sum is 33.

The spelling of 16540516221 in words is "sixteen billion, five hundred forty million, five hundred sixteen thousand, two hundred twenty-one".