2215518881 has 8 divisors (see below), whose sum is σ = 2287793664. Its totient is φ = 2143294560.

The previous prime is 2215518869. The next prime is 2215518901. The reversal of 2215518881 is 1888155122.

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 2215518881 - 2¹⁸ = 2215256737 is a prime.

It is a super-2 number, since 2×2215518881² = 9817047824134984322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2215518181) 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, 89996 + ... + 111938.

It is an arithmetic number, because the mean of its divisors is an integer number (285974208).

Almost surely, 2^2215518881 is an apocalyptic number.

It is an amenable number.

2215518881 is a deficient number, since it is larger than the sum of its proper divisors (72274783).

2215518881 is a wasteful number, since it uses less digits than its factorization.

2215518881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25231.

The product of its digits is 51200, while the sum is 41.

The square root of 2215518881 is about 47069.2987094560. The cubic root of 2215518881 is about 1303.6424241392.

The spelling of 2215518881 in words is "two billion, two hundred fifteen million, five hundred eighteen thousand, eight hundred eighty-one".