215115105 has 16 divisors (see below), whose sum is σ = 344620224. Its totient is φ = 114582720.

The previous prime is 215115101. The next prime is 215115119. The reversal of 215115105 is 501511512.

It is not a de Polignac number, because 215115105 - 2² = 215115101 is a prime.

It is a super-2 number, since 2×215115105² = 92549016798322050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (215115101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3735 + ... + 21075.

It is an arithmetic number, because the mean of its divisors is an integer number (21538764).

Almost surely, 2^215115105 is an apocalyptic number.

It is an amenable number.

215115105 is a deficient number, since it is larger than the sum of its proper divisors (129505119).

215115105 is a wasteful number, since it uses less digits than its factorization.

215115105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18176.

The product of its (nonzero) digits is 250, while the sum is 21.

The square root of 215115105 is about 14666.8028213377. The cubic root of 215115105 is about 599.1795313411.

Adding to 215115105 its reverse (501511512), we get a palindrome (716626617).

The spelling of 215115105 in words is "two hundred fifteen million, one hundred fifteen thousand, one hundred five".