1221134329 has 2 divisors, whose sum is σ = 1221134330. Its totient is φ = 1221134328.

The previous prime is 1221134311. The next prime is 1221134357. The reversal of 1221134329 is 9234311221.

It is a happy number.

It is an a-pointer prime, because the next prime (1221134357) can be obtained adding 1221134329 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1178205625 + 42928704 = 34325^2 + 6552^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221134329 - 2⁵ = 1221134297 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221134297 and 1221134306.

It is not a weakly prime, because it can be changed into another prime (1221134359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610567164 + 610567165.

It is an arithmetic number, because the mean of its divisors is an integer number (610567165).

Almost surely, 2^1221134329 is an apocalyptic number.

It is an amenable number.

1221134329 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221134329 is an equidigital number, since it uses as much as digits as its factorization.

1221134329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 28.

The square root of 1221134329 is about 34944.7324928951. The cubic root of 1221134329 is about 1068.8607926636.

The spelling of 1221134329 in words is "one billion, two hundred twenty-one million, one hundred thirty-four thousand, three hundred twenty-nine".