1224131521 has 2 divisors, whose sum is σ = 1224131522. Its totient is φ = 1224131520.

The previous prime is 1224131501. The next prime is 1224131533. The reversal of 1224131521 is 1251314221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 788991921 + 435139600 = 28089^2 + 20860^2 .

It is a cyclic number.

It is not a de Polignac number, because 1224131521 - 2¹⁹ = 1223607233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1224131492 and 1224131501.

It is not a weakly prime, because it can be changed into another prime (1224131501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612065760 + 612065761.

It is an arithmetic number, because the mean of its divisors is an integer number (612065761).

Almost surely, 2^1224131521 is an apocalyptic number.

It is an amenable number.

1224131521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1224131521 is an equidigital number, since it uses as much as digits as its factorization.

1224131521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480, while the sum is 22.

The square root of 1224131521 is about 34987.5909573666. The cubic root of 1224131521 is about 1069.7345604705.

Adding to 1224131521 its reverse (1251314221), we get a palindrome (2475445742).

The spelling of 1224131521 in words is "one billion, two hundred twenty-four million, one hundred thirty-one thousand, five hundred twenty-one".