216210105121 has 8 divisors (see below), whose sum is σ = 216563761064. Its totient is φ = 215856610560.

The previous prime is 216210105079. The next prime is 216210105149. The reversal of 216210105121 is 121501012612.

It can be written as a sum of positive squares in 4 ways, for example, as 14802128896 + 201407976225 = 121664^2 + 448785^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216210105121 - 2⁹ = 216210104609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216210105092 and 216210105101.

It is not an unprimeable number, because it can be changed into a prime (216210105521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2803801 + ... + 2879881.

It is an arithmetic number, because the mean of its divisors is an integer number (27070470133).

Almost surely, 2^216210105121 is an apocalyptic number.

It is an amenable number.

216210105121 is a deficient number, since it is larger than the sum of its proper divisors (353655943).

216210105121 is an equidigital number, since it uses as much as digits as its factorization.

216210105121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80691.

The product of its (nonzero) digits is 240, while the sum is 22.

Adding to 216210105121 its reverse (121501012612), we get a palindrome (337711117733).

The spelling of 216210105121 in words is "two hundred sixteen billion, two hundred ten million, one hundred five thousand, one hundred twenty-one".