221897341 has 4 divisors (see below), whose sum is σ = 222533500. Its totient is φ = 221261184.

The previous prime is 221897339. The next prime is 221897359. The reversal of 221897341 is 143798122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 140067225 + 81830116 = 11835^2 + 9046^2 .

It is a cyclic number.

It is not a de Polignac number, because 221897341 - 2¹ = 221897339 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221897341.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221897041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317556 + ... + 318253.

It is an arithmetic number, because the mean of its divisors is an integer number (55633375).

Almost surely, 2^221897341 is an apocalyptic number.

It is an amenable number.

221897341 is a deficient number, since it is larger than the sum of its proper divisors (636159).

221897341 is an equidigital number, since it uses as much as digits as its factorization.

221897341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636158.

The product of its digits is 24192, while the sum is 37.

The square root of 221897341 is about 14896.2190169184. The cubic root of 221897341 is about 605.4115461361.

The spelling of 221897341 in words is "two hundred twenty-one million, eight hundred ninety-seven thousand, three hundred forty-one".