221804866081 has 8 divisors (see below), whose sum is σ = 222524941824. Its totient is φ = 221084919120.

The previous prime is 221804866039. The next prime is 221804866147. The reversal of 221804866081 is 180668408122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221804866081 is a prime.

It is a super-2 number, since 2×221804866081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221804866681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4401216 + ... + 4451326.

It is an arithmetic number, because the mean of its divisors is an integer number (27815617728).

Almost surely, 2^221804866081 is an apocalyptic number.

It is an amenable number.

221804866081 is a deficient number, since it is larger than the sum of its proper divisors (720075743).

221804866081 is a wasteful number, since it uses less digits than its factorization.

221804866081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64391.

The product of its (nonzero) digits is 294912, while the sum is 46.

The spelling of 221804866081 in words is "two hundred twenty-one billion, eight hundred four million, eight hundred sixty-six thousand, eighty-one".