224432021543221 has 2 divisors, whose sum is σ = 224432021543222. Its totient is φ = 224432021543220.

The previous prime is 224432021543153. The next prime is 224432021543291. The reversal of 224432021543221 is 122345120234422.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162728011607121 + 61704009936100 = 12756489^2 + 7855190^2 .

It is a cyclic number.

It is not a de Polignac number, because 224432021543221 - 2²¹ = 224432019446069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (224432021543291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112216010771610 + 112216010771611.

It is an arithmetic number, because the mean of its divisors is an integer number (112216010771611).

Almost surely, 2^{224432021543221} is an apocalyptic number.

It is an amenable number.

224432021543221 is a deficient number, since it is larger than the sum of its proper divisors (1).

224432021543221 is an equidigital number, since it uses as much as digits as its factorization.

224432021543221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 184320, while the sum is 37.

Adding to 224432021543221 its reverse (122345120234422), we get a palindrome (346777141777643).

The spelling of 224432021543221 in words is "two hundred twenty-four trillion, four hundred thirty-two billion, twenty-one million, five hundred forty-three thousand, two hundred twenty-one".