1215520405213 has 4 divisors (see below), whose sum is σ = 1215523628668. Its totient is φ = 1215517181760.

The previous prime is 1215520405163. The next prime is 1215520405217. The reversal of 1215520405213 is 3125040255121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1093609794564 + 121910610649 = 1045758^2 + 349157^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215520405213 - 2⁹ = 1215520404701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215520405217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 957606 + ... + 1829767.

It is an arithmetic number, because the mean of its divisors is an integer number (303880907167).

Almost surely, 2^{1215520405213} is an apocalyptic number.

It is an amenable number.

1215520405213 is a deficient number, since it is larger than the sum of its proper divisors (3223455).

1215520405213 is an equidigital number, since it uses as much as digits as its factorization.

1215520405213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3223454.

The product of its (nonzero) digits is 12000, while the sum is 31.

The spelling of 1215520405213 in words is "one trillion, two hundred fifteen billion, five hundred twenty million, four hundred five thousand, two hundred thirteen".