216852087221 has 32 divisors (see below), whose sum is σ = 271098347520. Its totient is φ = 168515510400.

The previous prime is 216852087217. The next prime is 216852087233. The reversal of 216852087221 is 122780258612.

216852087221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 216852087221 - 2² = 216852087217 is a prime.

It is a super-4 number, since 4×216852087221⁴ (a number of 46 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216852087211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57533825 + ... + 57537593.

It is an arithmetic number, because the mean of its divisors is an integer number (8471823360).

Almost surely, 2^216852087221 is an apocalyptic number.

It is an amenable number.

216852087221 is a deficient number, since it is larger than the sum of its proper divisors (54246260299).

216852087221 is a wasteful number, since it uses less digits than its factorization.

216852087221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5625.

The product of its (nonzero) digits is 215040, while the sum is 44.

The spelling of 216852087221 in words is "two hundred sixteen billion, eight hundred fifty-two million, eighty-seven thousand, two hundred twenty-one".