1224331421 has 2 divisors, whose sum is σ = 1224331422. Its totient is φ = 1224331420.

The previous prime is 1224331417. The next prime is 1224331477. The reversal of 1224331421 is 1241334221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 629508100 + 594823321 = 25090^2 + 24389^2 .

It is a cyclic number.

It is not a de Polignac number, because 1224331421 - 2² = 1224331417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1224331411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612165710 + 612165711.

It is an arithmetic number, because the mean of its divisors is an integer number (612165711).

Almost surely, 2^1224331421 is an apocalyptic number.

It is an amenable number.

1224331421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1224331421 is an equidigital number, since it uses as much as digits as its factorization.

1224331421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 23.

The square root of 1224331421 is about 34990.4475678720. The cubic root of 1224331421 is about 1069.7927863218.

Adding to 1224331421 its reverse (1241334221), we get a palindrome (2465665642).

The spelling of 1224331421 in words is "one billion, two hundred twenty-four million, three hundred thirty-one thousand, four hundred twenty-one".