1215551332213 has 2 divisors, whose sum is σ = 1215551332214. Its totient is φ = 1215551332212.

The previous prime is 1215551332111. The next prime is 1215551332217. The reversal of 1215551332213 is 3122331555121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1211448032964 + 4103299249 = 1100658^2 + 64057^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215551332213 - 2²⁹ = 1215014461301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215551332217) 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, 607775666106 + 607775666107.

It is an arithmetic number, because the mean of its divisors is an integer number (607775666107).

Almost surely, 2^{1215551332213} is an apocalyptic number.

It is an amenable number.

1215551332213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215551332213 is an equidigital number, since it uses as much as digits as its factorization.

1215551332213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27000, while the sum is 34.

Adding to 1215551332213 its reverse (3122331555121), we get a palindrome (4337882887334).

The spelling of 1215551332213 in words is "one trillion, two hundred fifteen billion, five hundred fifty-one million, three hundred thirty-two thousand, two hundred thirteen".