21124224229 has 2 divisors, whose sum is σ = 21124224230. Its totient is φ = 21124224228.

The previous prime is 21124224169. The next prime is 21124224281. The reversal of 21124224229 is 92242242112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19460808004 + 1663416225 = 139502^2 + 40785^2 .

It is a cyclic number.

It is not a de Polignac number, because 21124224229 - 2⁷ = 21124224101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21124224229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21124224929) 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, 10562112114 + 10562112115.

It is an arithmetic number, because the mean of its divisors is an integer number (10562112115).

Almost surely, 2^21124224229 is an apocalyptic number.

It is an amenable number.

21124224229 is a deficient number, since it is larger than the sum of its proper divisors (1).

21124224229 is an equidigital number, since it uses as much as digits as its factorization.

21124224229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 31.

The spelling of 21124224229 in words is "twenty-one billion, one hundred twenty-four million, two hundred twenty-four thousand, two hundred twenty-nine".