221815795 has 16 divisors (see below), whose sum is σ = 283668480. Its totient is φ = 166121824.

The previous prime is 221815771. The next prime is 221815831. The reversal of 221815795 is 597518122.

It is not a de Polignac number, because 221815795 - 2¹³ = 221807603 is a prime.

It is a super-4 number, since 4×221815795⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

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, 15115 + ... + 25924.

It is an arithmetic number, because the mean of its divisors is an integer number (17729280).

Almost surely, 2^221815795 is an apocalyptic number.

221815795 is a deficient number, since it is larger than the sum of its proper divisors (61852685).

221815795 is a wasteful number, since it uses less digits than its factorization.

221815795 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41114.

The product of its digits is 50400, while the sum is 40.

The square root of 221815795 is about 14893.4816278800. The cubic root of 221815795 is about 605.3373752927.

The spelling of 221815795 in words is "two hundred twenty-one million, eight hundred fifteen thousand, seven hundred ninety-five".