221346684 has 36 divisors (see below), whose sum is σ = 602556136. Its totient is φ = 68106528.

The previous prime is 221346679. The next prime is 221346721. The reversal of 221346684 is 486643122.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 236014 + ... + 236949.

Almost surely, 2^221346684 is an apocalyptic number.

It is an amenable number.

221346684 is an abundant number, since it is smaller than the sum of its proper divisors (381209452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221346684 is a wasteful number, since it uses less digits than its factorization.

221346684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472986 (or 472981 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 221346684 is about 14877.7244227738. The cubic root of 221346684 is about 604.9103380092.

The spelling of 221346684 in words is "two hundred twenty-one million, three hundred forty-six thousand, six hundred eighty-four".