221356346 has 16 divisors (see below), whose sum is σ = 357640800. Its totient is φ = 102413808.

The previous prime is 221356313. The next prime is 221356349. The reversal of 221356346 is 643653122.

It is not an unprimeable number, because it can be changed into a prime (221356349) 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, 66101 + ... + 69368.

It is an arithmetic number, because the mean of its divisors is an integer number (22352550).

Almost surely, 2^221356346 is an apocalyptic number.

221356346 is a deficient number, since it is larger than the sum of its proper divisors (136284454).

221356346 is a wasteful number, since it uses less digits than its factorization.

221356346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135533.

The product of its digits is 25920, while the sum is 32.

The square root of 221356346 is about 14878.0491328668. The cubic root of 221356346 is about 604.9191395244.

The spelling of 221356346 in words is "two hundred twenty-one million, three hundred fifty-six thousand, three hundred forty-six".