216210210605 has 4 divisors (see below), whose sum is σ = 259452252732. Its totient is φ = 172968168480.

The previous prime is 216210210569. The next prime is 216210210631. The reversal of 216210210605 is 506012012612.

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

It can be written as a sum of positive squares in 2 ways, for example, as 89893231684 + 126316978921 = 299822^2 + 355411^2 .

It is not a de Polignac number, because 216210210605 - 2¹⁶ = 216210145069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21621021056 + ... + 21621021065.

It is an arithmetic number, because the mean of its divisors is an integer number (64863063183).

Almost surely, 2^216210210605 is an apocalyptic number.

It is an amenable number.

216210210605 is a deficient number, since it is larger than the sum of its proper divisors (43242042127).

216210210605 is an equidigital number, since it uses as much as digits as its factorization.

216210210605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43242042126.

The product of its (nonzero) digits is 1440, while the sum is 26.

The spelling of 216210210605 in words is "two hundred sixteen billion, two hundred ten million, two hundred ten thousand, six hundred five".