221346881 has 8 divisors (see below), whose sum is σ = 253214784. Its totient is φ = 189540720.

The previous prime is 221346869. The next prime is 221346887. The reversal of 221346881 is 188643122.

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 221346881 - 2¹⁸ = 221084737 is a prime.

It is a super-2 number, since 2×221346881² = 97988883456856322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221346887) 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, 7475 + ... + 22328.

It is an arithmetic number, because the mean of its divisors is an integer number (31651848).

Almost surely, 2^221346881 is an apocalyptic number.

It is an amenable number.

221346881 is a deficient number, since it is larger than the sum of its proper divisors (31867903).

221346881 is a wasteful number, since it uses less digits than its factorization.

221346881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30871.

The product of its digits is 18432, while the sum is 35.

The square root of 221346881 is about 14877.7310434085. The cubic root of 221346881 is about 604.9105174672.

It can be divided in two parts, 2213 and 46881, that added together give a palindrome (49094).

The spelling of 221346881 in words is "two hundred twenty-one million, three hundred forty-six thousand, eight hundred eighty-one".