221678881 has 8 divisors (see below), whose sum is σ = 226494464. Its totient is φ = 216911520.

The previous prime is 221678879. The next prime is 221678927. The reversal of 221678881 is 188876122.

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

It is a cyclic number.

It is not a de Polignac number, because 221678881 - 2¹ = 221678879 is a prime.

It is a super-2 number, since 2×221678881² = 98283052562824322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221678081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2685 + ... + 21226.

It is an arithmetic number, because the mean of its divisors is an integer number (28311808).

Almost surely, 2^221678881 is an apocalyptic number.

It is an amenable number.

221678881 is a deficient number, since it is larger than the sum of its proper divisors (4815583).

221678881 is a wasteful number, since it uses less digits than its factorization.

221678881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24111.

The product of its digits is 86016, while the sum is 43.

The square root of 221678881 is about 14888.8844780259. The cubic root of 221678881 is about 605.2128031307.

The spelling of 221678881 in words is "two hundred twenty-one million, six hundred seventy-eight thousand, eight hundred eighty-one".