1221322013 has 2 divisors, whose sum is σ = 1221322014. Its totient is φ = 1221322012.

The previous prime is 1221321977. The next prime is 1221322021. The reversal of 1221322013 is 3102231221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1152398809 + 68923204 = 33947^2 + 8302^2 .

It is an emirp because it is prime and its reverse (3102231221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221322013 - 2¹⁸ = 1221059869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221321982 and 1221322000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221322073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610661006 + 610661007.

It is an arithmetic number, because the mean of its divisors is an integer number (610661007).

Almost surely, 2^1221322013 is an apocalyptic number.

It is an amenable number.

1221322013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221322013 is an equidigital number, since it uses as much as digits as its factorization.

1221322013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1221322013 is about 34947.4178302203. The cubic root of 1221322013 is about 1068.9155498916.

Adding to 1221322013 its reverse (3102231221), we get a palindrome (4323553234).

The spelling of 1221322013 in words is "one billion, two hundred twenty-one million, three hundred twenty-two thousand, thirteen".