221084645 has 8 divisors (see below), whose sum is σ = 265476120. Its totient is φ = 176751360.

The previous prime is 221084621. The next prime is 221084681. The reversal of 221084645 is 546480122.

It can be written as a sum of positive squares in 4 ways, for example, as 143256961 + 77827684 = 11969^2 + 8822^2 .

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

It is not a de Polignac number, because 221084645 - 2¹⁶ = 221019109 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5696 + ... + 21785.

It is an arithmetic number, because the mean of its divisors is an integer number (33184515).

Almost surely, 2^221084645 is an apocalyptic number.

It is an amenable number.

221084645 is a deficient number, since it is larger than the sum of its proper divisors (44391475).

221084645 is a wasteful number, since it uses less digits than its factorization.

221084645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29095.

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 221084645 is about 14868.9153942041. The cubic root of 221084645 is about 604.6715381191.

The spelling of 221084645 in words is "two hundred twenty-one million, eighty-four thousand, six hundred forty-five".