224221122421 has 2 divisors, whose sum is σ = 224221122422. Its totient is φ = 224221122420.

The previous prime is 224221122397. The next prime is 224221122427. The reversal of 224221122421 is 124221122422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204421536900 + 19799585521 = 452130^2 + 140711^2 .

It is a cyclic number.

It is not a de Polignac number, because 224221122421 - 2¹⁷ = 224220991349 is a prime.

It is a super-2 number, since 2×224221122421² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (224221122427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112110561210 + 112110561211.

It is an arithmetic number, because the mean of its divisors is an integer number (112110561211).

Almost surely, 2^224221122421 is an apocalyptic number.

It is an amenable number.

224221122421 is a deficient number, since it is larger than the sum of its proper divisors (1).

224221122421 is an equidigital number, since it uses as much as digits as its factorization.

224221122421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2048, while the sum is 25.

Adding to 224221122421 its reverse (124221122422), we get a palindrome (348442244843).

Subtracting from 224221122421 its reverse (124221122422), we obtain a palindrome (99999999999).

The spelling of 224221122421 in words is "two hundred twenty-four billion, two hundred twenty-one million, one hundred twenty-two thousand, four hundred twenty-one".