11215115542105 has 4 divisors (see below), whose sum is σ = 13458138650532. Its totient is φ = 8972092433680.

The previous prime is 11215115542097. The next prime is 11215115542217. The reversal of 11215115542105 is 50124551151211.

It is a happy number.

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 1997801326096 + 9217314216009 = 1413436^2 + 3036003^2 .

It is not a de Polignac number, because 11215115542105 - 2³ = 11215115542097 is a prime.

It is a Duffinian 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, 1121511554206 + ... + 1121511554215.

It is an arithmetic number, because the mean of its divisors is an integer number (3364534662633).

Almost surely, 2^{11215115542105} is an apocalyptic number.

It is an amenable number.

11215115542105 is a deficient number, since it is larger than the sum of its proper divisors (2243023108427).

11215115542105 is an equidigital number, since it uses as much as digits as its factorization.

11215115542105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2243023108426.

The product of its (nonzero) digits is 10000, while the sum is 34.

Adding to 11215115542105 its reverse (50124551151211), we get a palindrome (61339666693316).

The spelling of 11215115542105 in words is "eleven trillion, two hundred fifteen billion, one hundred fifteen million, five hundred forty-two thousand, one hundred five".