221355146 has 8 divisors (see below), whose sum is σ = 340131204. Its totient is φ = 107978080.

The previous prime is 221355133. The next prime is 221355161. The reversal of 221355146 is 641553122.

It can be written as a sum of positive squares in 2 ways, for example, as 218714521 + 2640625 = 14789^2 + 1625^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1349645 + ... + 1349808.

Almost surely, 2^221355146 is an apocalyptic number.

221355146 is a deficient number, since it is larger than the sum of its proper divisors (118776058).

221355146 is a wasteful number, since it uses less digits than its factorization.

221355146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2699496.

The product of its digits is 7200, while the sum is 29.

The square root of 221355146 is about 14878.0088049443. The cubic root of 221355146 is about 604.9180464088.

The spelling of 221355146 in words is "two hundred twenty-one million, three hundred fifty-five thousand, one hundred forty-six".