221849297 has 2 divisors, whose sum is σ = 221849298. Its totient is φ = 221849296.

The previous prime is 221849291. The next prime is 221849387. The reversal of 221849297 is 792948122.

221849297 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167547136 + 54302161 = 12944^2 + 7369^2 .

It is a cyclic number.

It is not a de Polignac number, because 221849297 - 2¹⁰ = 221848273 is a prime.

It is a super-2 number, since 2×221849297² = 98434221158788418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221849291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110924648 + 110924649.

It is an arithmetic number, because the mean of its divisors is an integer number (110924649).

Almost surely, 2^221849297 is an apocalyptic number.

It is an amenable number.

221849297 is a deficient number, since it is larger than the sum of its proper divisors (1).

221849297 is an equidigital number, since it uses as much as digits as its factorization.

221849297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 221849297 is about 14894.6063056396. The cubic root of 221849297 is about 605.3678495154.

It can be divided in two parts, 2218 and 49297, that added together give a palindrome (51515).

The spelling of 221849297 in words is "two hundred twenty-one million, eight hundred forty-nine thousand, two hundred ninety-seven".