216210520051 has 4 divisors (see below), whose sum is σ = 216605786632. Its totient is φ = 215815253472.

The previous prime is 216210520037. The next prime is 216210520067. The reversal of 216210520051 is 150025012612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216210520051 - 2¹¹ = 216210518003 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216210519998 and 216210520025.

It is not an unprimeable number, because it can be changed into a prime (216210520021) 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 3 ways as a sum of consecutive naturals, for example, 197632470 + ... + 197633563.

It is an arithmetic number, because the mean of its divisors is an integer number (54151446658).

Almost surely, 2^216210520051 is an apocalyptic number.

216210520051 is a deficient number, since it is larger than the sum of its proper divisors (395266581).

216210520051 is an equidigital number, since it uses as much as digits as its factorization.

216210520051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395266580.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 216210520051 its reverse (150025012612), we get a palindrome (366235532663).

The spelling of 216210520051 in words is "two hundred sixteen billion, two hundred ten million, five hundred twenty thousand, fifty-one".