221847845 has 16 divisors (see below), whose sum is σ = 269172288. Its totient is φ = 175518720.

The previous prime is 221847833. The next prime is 221847859. The reversal of 221847845 is 548748122.

It is not a de Polignac number, because 221847845 - 2²⁰ = 220799269 is a prime.

It is a super-2 number, since 2×221847845² = 98432932662288050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 377642 + ... + 378228.

It is an arithmetic number, because the mean of its divisors is an integer number (16823268).

Almost surely, 2^221847845 is an apocalyptic number.

It is an amenable number.

221847845 is a deficient number, since it is larger than the sum of its proper divisors (47324443).

221847845 is a wasteful number, since it uses less digits than its factorization.

221847845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300.

The product of its digits is 143360, while the sum is 41.

The square root of 221847845 is about 14894.5575630832. The cubic root of 221847845 is about 605.3665288050.

The spelling of 221847845 in words is "two hundred twenty-one million, eight hundred forty-seven thousand, eight hundred forty-five".