16256354221 has 4 divisors (see below), whose sum is σ = 16256715552. Its totient is φ = 16255992892.

The previous prime is 16256354209. The next prime is 16256354249. The reversal of 16256354221 is 12245365261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16256354221 - 2¹⁷ = 16256223149 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 (16256354321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101665 + ... + 206998.

It is an arithmetic number, because the mean of its divisors is an integer number (4064178888).

Almost surely, 2^16256354221 is an apocalyptic number.

It is an amenable number.

16256354221 is a deficient number, since it is larger than the sum of its proper divisors (361331).

16256354221 is an equidigital number, since it uses as much as digits as its factorization.

16256354221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361330.

The product of its digits is 86400, while the sum is 37.

The spelling of 16256354221 in words is "sixteen billion, two hundred fifty-six million, three hundred fifty-four thousand, two hundred twenty-one".