1321420687 has 2 divisors, whose sum is σ = 1321420688. Its totient is φ = 1321420686.

The previous prime is 1321420657. The next prime is 1321420717. The reversal of 1321420687 is 7860241231.

It is a balanced prime because it is at equal distance from previous prime (1321420657) and next prime (1321420717).

It is an emirp because it is prime and its reverse (7860241231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321420687 - 2¹⁹ = 1320896399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321420637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660710343 + 660710344.

It is an arithmetic number, because the mean of its divisors is an integer number (660710344).

Almost surely, 2^1321420687 is an apocalyptic number.

1321420687 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321420687 is an equidigital number, since it uses as much as digits as its factorization.

1321420687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 1321420687 is about 36351.3505526273. The cubic root of 1321420687 is about 1097.3547145024.

The spelling of 1321420687 in words is "one billion, three hundred twenty-one million, four hundred twenty thousand, six hundred eighty-seven".