1215521103055 has 32 divisors (see below), whose sum is σ = 1757020636800. Its totient is φ = 789574636032.

The previous prime is 1215521103031. The next prime is 1215521103091. The reversal of 1215521103055 is 5503011255121.

It is a de Polignac number, because none of the positive numbers 2^k-1215521103055 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11243920 + ... + 11351509.

It is an arithmetic number, because the mean of its divisors is an integer number (54906894900).

Almost surely, 2^{1215521103055} is an apocalyptic number.

1215521103055 is a deficient number, since it is larger than the sum of its proper divisors (541499533745).

1215521103055 is a wasteful number, since it uses less digits than its factorization.

1215521103055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22595523.

The product of its (nonzero) digits is 7500, while the sum is 31.

Adding to 1215521103055 its reverse (5503011255121), we get a palindrome (6718532358176).

The spelling of 1215521103055 in words is "one trillion, two hundred fifteen billion, five hundred twenty-one million, one hundred three thousand, fifty-five".