1215010105205 has 8 divisors (see below), whose sum is σ = 1570166905272. Its totient is φ = 897238231488.

The previous prime is 1215010105157. The next prime is 1215010105207. The reversal of 1215010105205 is 5025010105121.

It can be written as a sum of positive squares in 4 ways, for example, as 207929616049 + 1007080489156 = 455993^2 + 1003534^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1215010105205 - 2²⁸ = 1214741669749 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 (1215010105207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9346231514 + ... + 9346231643.

It is an arithmetic number, because the mean of its divisors is an integer number (196270863159).

Almost surely, 2^{1215010105205} is an apocalyptic number.

It is an amenable number.

1215010105205 is a deficient number, since it is larger than the sum of its proper divisors (355156800067).

1215010105205 is a wasteful number, since it uses less digits than its factorization.

1215010105205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18692463175.

The product of its (nonzero) digits is 500, while the sum is 23.

The spelling of 1215010105205 in words is "one trillion, two hundred fifteen billion, ten million, one hundred five thousand, two hundred five".