2215521544155 has 32 divisors (see below), whose sum is σ = 3771142645248. Its totient is φ = 1106834265600.

The previous prime is 2215521544151. The next prime is 2215521544193. The reversal of 2215521544155 is 5514451255122.

It is not a de Polignac number, because 2215521544155 - 2² = 2215521544151 is a prime.

It is a super-2 number, since 2×2215521544155² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2215521544151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20534631 + ... + 20642240.

It is an arithmetic number, because the mean of its divisors is an integer number (117848207664).

Almost surely, 2^{2215521544155} is an apocalyptic number.

2215521544155 is a deficient number, since it is larger than the sum of its proper divisors (1555621101093).

2215521544155 is a wasteful number, since it uses less digits than its factorization.

2215521544155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41177107.

The product of its digits is 400000, while the sum is 42.

Adding to 2215521544155 its reverse (5514451255122), we get a palindrome (7729972799277).

The spelling of 2215521544155 in words is "two trillion, two hundred fifteen billion, five hundred twenty-one million, five hundred forty-four thousand, one hundred fifty-five".