216020521655210 has 32 divisors (see below), whose sum is σ = 411779947635792. Its totient is φ = 81311496801280.

The previous prime is 216020521655209. The next prime is 216020521655219. The reversal of 216020521655210 is 12556125020612.

It can be written as a sum of positive squares in 8 ways, for example, as 190083492203929 + 25937029451281 = 13787077^2 + 5092841^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216020521655219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107407397 + ... + 109400136.

Almost surely, 2^{216020521655210} is an apocalyptic number.

216020521655210 is a deficient number, since it is larger than the sum of its proper divisors (195759425980582).

216020521655210 is a wasteful number, since it uses less digits than its factorization.

216020521655210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216813418.

The product of its (nonzero) digits is 72000, while the sum is 38.

Adding to 216020521655210 its reverse (12556125020612), we get a palindrome (228576646675822).

The spelling of 216020521655210 in words is "two hundred sixteen trillion, twenty billion, five hundred twenty-one million, six hundred fifty-five thousand, two hundred ten".