2216021256 has 48 divisors (see below), whose sum is σ = 6015669660. Its totient is φ = 736957440.

The previous prime is 2216021251. The next prime is 2216021287. The reversal of 2216021256 is 6521206122.

2216021256 is a `hidden beast` number, since 2 + 2 + 1 + 602 + 1 + 2 + 56 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2209940100 + 6081156 = 47010^2 + 2466^2 .

It is a super-4 number, since 4×2216021256⁴ (a number of 38 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (2216021251) 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, 4365 + ... + 66716.

Almost surely, 2^2216021256 is an apocalyptic number.

It is an amenable number.

2216021256 is an abundant number, since it is smaller than the sum of its proper divisors (3799648404).

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

2216021256 is a wasteful number, since it uses less digits than its factorization.

2216021256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71526 (or 71519 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 2216021256 is about 47074.6349534439. The cubic root of 2216021256 is about 1303.7409515276.

Adding to 2216021256 its reverse (6521206122), we get a palindrome (8737227378).

The spelling of 2216021256 in words is "two billion, two hundred sixteen million, twenty-one thousand, two hundred fifty-six".