4661224517221 has 2 divisors, whose sum is σ = 4661224517222. Its totient is φ = 4661224517220.

The previous prime is 4661224517161. The next prime is 4661224517273. The reversal of 4661224517221 is 1227154221664.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4118306068321 + 542918448900 = 2029361^2 + 736830^2 .

It is a cyclic number.

It is not a de Polignac number, because 4661224517221 - 2³⁷ = 4523785563749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4661224517281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2330612258610 + 2330612258611.

It is an arithmetic number, because the mean of its divisors is an integer number (2330612258611).

Almost surely, 2^{4661224517221} is an apocalyptic number.

It is an amenable number.

4661224517221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4661224517221 is an equidigital number, since it uses as much as digits as its factorization.

4661224517221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 43.

Adding to 4661224517221 its reverse (1227154221664), we get a palindrome (5888378738885).

The spelling of 4661224517221 in words is "four trillion, six hundred sixty-one billion, two hundred twenty-four million, five hundred seventeen thousand, two hundred twenty-one".