2215534820 has 12 divisors (see below), whose sum is σ = 4652623164. Its totient is φ = 886213920.

The previous prime is 2215534817. The next prime is 2215534829. The reversal of 2215534820 is 284355122.

It can be written as a sum of positive squares in 2 ways, for example, as 372721636 + 1842813184 = 19306^2 + 42928^2 .

It is not an unprimeable number, because it can be changed into a prime (2215534829) 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 3 ways as a sum of consecutive naturals, for example, 55388351 + ... + 55388390.

It is an arithmetic number, because the mean of its divisors is an integer number (387718597).

Almost surely, 2^2215534820 is an apocalyptic number.

2215534820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2215534820 is an abundant number, since it is smaller than the sum of its proper divisors (2437088344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2215534820 is a wasteful number, since it uses less digits than its factorization.

2215534820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110776750 (or 110776748 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 2215534820 is about 47069.4680233376. The cubic root of 2215534820 is about 1303.6455503756.

Adding to 2215534820 its reverse (284355122), we get a palindrome (2499889942).

The spelling of 2215534820 in words is "two billion, two hundred fifteen million, five hundred thirty-four thousand, eight hundred twenty".