1321021007 has 2 divisors, whose sum is σ = 1321021008. Its totient is φ = 1321021006.

The previous prime is 1321020979. The next prime is 1321021069. The reversal of 1321021007 is 7001201231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321021007 - 2¹² = 1321016911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321023007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660510503 + 660510504.

It is an arithmetic number, because the mean of its divisors is an integer number (660510504).

Almost surely, 2^1321021007 is an apocalyptic number.

1321021007 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321021007 is an equidigital number, since it uses as much as digits as its factorization.

1321021007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 1321021007 is about 36345.8526795011. The cubic root of 1321021007 is about 1097.2440671860.

Adding to 1321021007 its reverse (7001201231), we get a palindrome (8322222238).

The spelling of 1321021007 in words is "one billion, three hundred twenty-one million, twenty-one thousand, seven".