16256106416221 has 16 divisors (see below), whose sum is σ = 18867630735360. Its totient is φ = 13718562989040.

The previous prime is 16256106416213. The next prime is 16256106416233. The reversal of 16256106416221 is 12261460165261.

It is not a de Polignac number, because 16256106416221 - 2³ = 16256106416213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16256106416261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69676801 + ... + 69909718.

It is an arithmetic number, because the mean of its divisors is an integer number (1179226920960).

Almost surely, 2^{16256106416221} is an apocalyptic number.

It is an amenable number.

16256106416221 is a deficient number, since it is larger than the sum of its proper divisors (2611524319139).

16256106416221 is a wasteful number, since it uses less digits than its factorization.

16256106416221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139586784.

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 16256106416221 in words is "sixteen trillion, two hundred fifty-six billion, one hundred six million, four hundred sixteen thousand, two hundred twenty-one".