2215788921 has 12 divisors (see below), whose sum is σ = 3203200000. Its totient is φ = 1475985240.

The previous prime is 2215788907. The next prime is 2215788923. The reversal of 2215788921 is 1298875122.

It is not a de Polignac number, because 2215788921 - 2¹⁸ = 2215526777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2215788923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88921 + ... + 111078.

Almost surely, 2^2215788921 is an apocalyptic number.

It is an amenable number.

2215788921 is a deficient number, since it is larger than the sum of its proper divisors (987411079).

2215788921 is a wasteful number, since it uses less digits than its factorization.

2215788921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201236 (or 201233 counting only the distinct ones).

The product of its digits is 161280, while the sum is 45.

The square root of 2215788921 is about 47072.1671585237. The cubic root of 2215788921 is about 1303.6953870970.

The spelling of 2215788921 in words is "two billion, two hundred fifteen million, seven hundred eighty-eight thousand, nine hundred twenty-one".