1224342521 has 2 divisors, whose sum is σ = 1224342522. Its totient is φ = 1224342520.

The previous prime is 1224342491. The next prime is 1224342547. The reversal of 1224342521 is 1252434221.

It is an a-pointer prime, because the next prime (1224342547) can be obtained adding 1224342521 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 782880400 + 441462121 = 27980^2 + 21011^2 .

It is a cyclic number.

It is not a de Polignac number, because 1224342521 - 2²² = 1220148217 is a prime.

It is not a weakly prime, because it can be changed into another prime (1224342221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612171260 + 612171261.

It is an arithmetic number, because the mean of its divisors is an integer number (612171261).

Almost surely, 2^1224342521 is an apocalyptic number.

It is an amenable number.

1224342521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1224342521 is an equidigital number, since it uses as much as digits as its factorization.

1224342521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 26.

The square root of 1224342521 is about 34990.6061822313. The cubic root of 1224342521 is about 1069.7960192874.

Adding to 1224342521 its reverse (1252434221), we get a palindrome (2476776742).

The spelling of 1224342521 in words is "one billion, two hundred twenty-four million, three hundred forty-two thousand, five hundred twenty-one".