1221433453 has 2 divisors, whose sum is σ = 1221433454. Its totient is φ = 1221433452.

The previous prime is 1221433429. The next prime is 1221433483. The reversal of 1221433453 is 3543341221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1002482244 + 218951209 = 31662^2 + 14797^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221433453 - 2⁹ = 1221432941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221433483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610716726 + 610716727.

It is an arithmetic number, because the mean of its divisors is an integer number (610716727).

Almost surely, 2^1221433453 is an apocalyptic number.

It is an amenable number.

1221433453 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221433453 is an equidigital number, since it uses as much as digits as its factorization.

1221433453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 28.

The square root of 1221433453 is about 34949.0121891878. The cubic root of 1221433453 is about 1068.9480601072.

Adding to 1221433453 its reverse (3543341221), we get a palindrome (4764774674).

The spelling of 1221433453 in words is "one billion, two hundred twenty-one million, four hundred thirty-three thousand, four hundred fifty-three".