221904242426881 has 16 divisors (see below), whose sum is σ = 268523268431616. Its totient is φ = 179014862048256.

The previous prime is 221904242426773. The next prime is 221904242426899. The reversal of 221904242426881 is 188624242409122.

It is a cyclic number.

It is not a de Polignac number, because 221904242426881 - 2⁷ = 221904242426753 is a prime.

It is a super-2 number, since 2×221904242426881² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221904242420881) 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 15 ways as a sum of consecutive naturals, for example, 81002700 + ... + 83697346.

It is an arithmetic number, because the mean of its divisors is an integer number (16782704276976).

Almost surely, 2^{221904242426881} is an apocalyptic number.

It is an amenable number.

221904242426881 is a deficient number, since it is larger than the sum of its proper divisors (46619026004735).

221904242426881 is a wasteful number, since it uses less digits than its factorization.

221904242426881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3386688.

The product of its (nonzero) digits is 7077888, while the sum is 55.

The spelling of 221904242426881 in words is "two hundred twenty-one trillion, nine hundred four billion, two hundred forty-two million, four hundred twenty-six thousand, eight hundred eighty-one".