1224130021 has 2 divisors, whose sum is σ = 1224130022. Its totient is φ = 1224130020.

The previous prime is 1224130007. The next prime is 1224130027. The reversal of 1224130021 is 1200314221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1121513121 + 102616900 = 33489^2 + 10130^2 .

It is an emirp because it is prime and its reverse (1200314221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1224130021 - 2¹⁵ = 1224097253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1224129977 and 1224130004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1224130027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612065010 + 612065011.

It is an arithmetic number, because the mean of its divisors is an integer number (612065011).

Almost surely, 2^1224130021 is an apocalyptic number.

It is an amenable number.

1224130021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1224130021 is an equidigital number, since it uses as much as digits as its factorization.

1224130021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1224130021 is about 34987.5695211885. The cubic root of 1224130021 is about 1069.7341235342.

Adding to 1224130021 its reverse (1200314221), we get a palindrome (2424444242).

The spelling of 1224130021 in words is "one billion, two hundred twenty-four million, one hundred thirty thousand, twenty-one".