2216221521 has 16 divisors (see below), whose sum is σ = 2969809920. Its totient is φ = 1470076880.

The previous prime is 2216221493. The next prime is 2216221549. The reversal of 2216221521 is 1251226122.

It is an interprime number because it is at equal distance from previous prime (2216221493) and next prime (2216221549).

It is a cyclic number.

It is not a de Polignac number, because 2216221521 - 2²² = 2212027217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2216221491 and 2216221500.

It is not an unprimeable number, because it can be changed into a prime (2216221571) 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 15 ways as a sum of consecutive naturals, for example, 539686 + ... + 543776.

It is an arithmetic number, because the mean of its divisors is an integer number (185613120).

Almost surely, 2^2216221521 is an apocalyptic number.

It is an amenable number.

2216221521 is a deficient number, since it is larger than the sum of its proper divisors (753588399).

2216221521 is a wasteful number, since it uses less digits than its factorization.

2216221521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4956.

The product of its digits is 960, while the sum is 24.

The square root of 2216221521 is about 47076.7620063232. The cubic root of 2216221521 is about 1303.7802239874.

Adding to 2216221521 its reverse (1251226122), we get a palindrome (3467447643).

The spelling of 2216221521 in words is "two billion, two hundred sixteen million, two hundred twenty-one thousand, five hundred twenty-one".