215052016221 has 24 divisors (see below), whose sum is σ = 358995349440. Its totient is φ = 121506111936.

The previous prime is 215052016213. The next prime is 215052016271. The reversal of 215052016221 is 122610250512.

215052016221 is a `hidden beast` number, since 2 + 15 + 0 + 5 + 20 + 1 + 622 + 1 = 666.

It is not a de Polignac number, because 215052016221 - 2³ = 215052016213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215052016271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19171495 + ... + 19182708.

It is an arithmetic number, because the mean of its divisors is an integer number (14958139560).

Almost surely, 2^215052016221 is an apocalyptic number.

215052016221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

215052016221 is a deficient number, since it is larger than the sum of its proper divisors (143943333219).

215052016221 is a wasteful number, since it uses less digits than its factorization.

215052016221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38354305 (or 38354302 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 215052016221 its reverse (122610250512), we get a palindrome (337662266733).

The spelling of 215052016221 in words is "two hundred fifteen billion, fifty-two million, sixteen thousand, two hundred twenty-one".