2215722856 has 16 divisors (see below), whose sum is σ = 4155079140. Its totient is φ = 1107701760.

The previous prime is 2215722853. The next prime is 2215722869. The reversal of 2215722856 is 6582275122.

It can be written as a sum of positive squares in 2 ways, for example, as 1764840100 + 450882756 = 42010^2 + 21234^2 .

It is not an unprimeable number, because it can be changed into a prime (2215722851) 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 3 ways as a sum of consecutive naturals, for example, 56040 + ... + 87016.

Almost surely, 2^2215722856 is an apocalyptic number.

It is an amenable number.

2215722856 is a deficient number, since it is larger than the sum of its proper divisors (1939356284).

2215722856 is a wasteful number, since it uses less digits than its factorization.

2215722856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39924 (or 39920 counting only the distinct ones).

The product of its digits is 134400, while the sum is 40.

The square root of 2215722856 is about 47071.4654116483. The cubic root of 2215722856 is about 1303.6824301631.

Adding to 2215722856 its reverse (6582275122), we get a palindrome (8797997978).

The spelling of 2215722856 in words is "two billion, two hundred fifteen million, seven hundred twenty-two thousand, eight hundred fifty-six".