2216221520 has 20 divisors (see below), whose sum is σ = 5152715220. Its totient is φ = 886488576.

The previous prime is 2216221493. The next prime is 2216221549. The reversal of 2216221520 is 251226122.

It can be written as a sum of positive squares in 2 ways, for example, as 1752594496 + 463627024 = 41864^2 + 21532^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×2216221520² = 9823275651422220800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13851305 + ... + 13851464.

It is an arithmetic number, because the mean of its divisors is an integer number (257635761).

Almost surely, 2^2216221520 is an apocalyptic number.

2216221520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2216221520 is an abundant number, since it is smaller than the sum of its proper divisors (2936493700).

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

2216221520 is a wasteful number, since it uses less digits than its factorization.

2216221520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27702782 (or 27702776 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 2216221520 is about 47076.7619957023. The cubic root of 2216221520 is about 1303.7802237913.

Adding to 2216221520 its reverse (251226122), we get a palindrome (2467447642).

The spelling of 2216221520 in words is "two billion, two hundred sixteen million, two hundred twenty-one thousand, five hundred twenty".