1321533013 has 2 divisors, whose sum is σ = 1321533014. Its totient is φ = 1321533012.

The previous prime is 1321532977. The next prime is 1321533019. The reversal of 1321533013 is 3103351231.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1118099844 + 203433169 = 33438^2 + 14263^2 .

It is an emirp because it is prime and its reverse (3103351231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321533013 - 2¹³ = 1321524821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321533019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660766506 + 660766507.

It is an arithmetic number, because the mean of its divisors is an integer number (660766507).

Almost surely, 2^1321533013 is an apocalyptic number.

It is an amenable number.

1321533013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321533013 is an equidigital number, since it uses as much as digits as its factorization.

1321533013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 810, while the sum is 22.

The square root of 1321533013 is about 36352.8955242908. The cubic root of 1321533013 is about 1097.3858067893.

Adding to 1321533013 its reverse (3103351231), we get a palindrome (4424884244).

The spelling of 1321533013 in words is "one billion, three hundred twenty-one million, five hundred thirty-three thousand, thirteen".