1209013321 has 2 divisors, whose sum is σ = 1209013322. Its totient is φ = 1209013320.

The previous prime is 1209013319. The next prime is 1209013349. The reversal of 1209013321 is 1233109021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 975687696 + 233325625 = 31236^2 + 15275^2 .

It is an emirp because it is prime and its reverse (1233109021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1209013321 - 2¹ = 1209013319 is a prime.

Together with 1209013319, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1209013292 and 1209013301.

It is not a weakly prime, because it can be changed into another prime (1209013621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604506660 + 604506661.

It is an arithmetic number, because the mean of its divisors is an integer number (604506661).

Almost surely, 2^1209013321 is an apocalyptic number.

It is an amenable number.

1209013321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209013321 is an equidigital number, since it uses as much as digits as its factorization.

1209013321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 1209013321 is about 34770.8688559835. The cubic root of 1209013321 is about 1065.3125141042.

The spelling of 1209013321 in words is "one billion, two hundred nine million, thirteen thousand, three hundred twenty-one".