1321121239 has 2 divisors, whose sum is σ = 1321121240. Its totient is φ = 1321121238.

The previous prime is 1321121233. The next prime is 1321121257. The reversal of 1321121239 is 9321211231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321121239 - 2³ = 1321121231 is a prime.

It is a super-2 number, since 2×1321121239² = 3490722656273790242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321121231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660560619 + 660560620.

It is an arithmetic number, because the mean of its divisors is an integer number (660560620).

Almost surely, 2^1321121239 is an apocalyptic number.

1321121239 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321121239 is an equidigital number, since it uses as much as digits as its factorization.

1321121239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 25.

The square root of 1321121239 is about 36347.2315176823. The cubic root of 1321121239 is about 1097.2718174855.

The spelling of 1321121239 in words is "one billion, three hundred twenty-one million, one hundred twenty-one thousand, two hundred thirty-nine".