1221829339 has 2 divisors, whose sum is σ = 1221829340. Its totient is φ = 1221829338.

The previous prime is 1221829331. The next prime is 1221829351. The reversal of 1221829339 is 9339281221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221829339 - 2³ = 1221829331 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221829331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610914669 + 610914670.

It is an arithmetic number, because the mean of its divisors is an integer number (610914670).

Almost surely, 2^1221829339 is an apocalyptic number.

1221829339 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221829339 is an equidigital number, since it uses as much as digits as its factorization.

1221829339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 40.

The square root of 1221829339 is about 34954.6754955614. The cubic root of 1221829339 is about 1069.0635353190.

The spelling of 1221829339 in words is "one billion, two hundred twenty-one million, eight hundred twenty-nine thousand, three hundred thirty-nine".