221244461 has 2 divisors, whose sum is σ = 221244462. Its totient is φ = 221244460.

The previous prime is 221244431. The next prime is 221244469. The reversal of 221244461 is 164442122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119355625 + 101888836 = 10925^2 + 10094^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221244461 is a prime.

It is a super-2 number, since 2×221244461² = 97898223046361042, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221244461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221244469) 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 as a sum of consecutive naturals, namely, 110622230 + 110622231.

It is an arithmetic number, because the mean of its divisors is an integer number (110622231).

Almost surely, 2^221244461 is an apocalyptic number.

It is an amenable number.

221244461 is a deficient number, since it is larger than the sum of its proper divisors (1).

221244461 is an equidigital number, since it uses as much as digits as its factorization.

221244461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3072, while the sum is 26.

The square root of 221244461 is about 14874.2885880300. The cubic root of 221244461 is about 604.8172031587.

Adding to 221244461 its reverse (164442122), we get a palindrome (385686583).

The spelling of 221244461 in words is "two hundred twenty-one million, two hundred forty-four thousand, four hundred sixty-one".