1215102052405 has 4 divisors (see below), whose sum is σ = 1458122462892. Its totient is φ = 972081641920.

The previous prime is 1215102052399. The next prime is 1215102052427. The reversal of 1215102052405 is 5042502015121.

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 554342789764 + 660759262641 = 744542^2 + 812871^2 .

It is not a de Polignac number, because 1215102052405 - 2⁹ = 1215102051893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121510205236 + ... + 121510205245.

It is an arithmetic number, because the mean of its divisors is an integer number (364530615723).

Almost surely, 2^{1215102052405} is an apocalyptic number.

It is an amenable number.

1215102052405 is a deficient number, since it is larger than the sum of its proper divisors (243020410487).

1215102052405 is an equidigital number, since it uses as much as digits as its factorization.

1215102052405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243020410486.

The product of its (nonzero) digits is 4000, while the sum is 28.

Adding to 1215102052405 its reverse (5042502015121), we get a palindrome (6257604067526).

The spelling of 1215102052405 in words is "one trillion, two hundred fifteen billion, one hundred two million, fifty-two thousand, four hundred five".