212214642665 has 4 divisors (see below), whose sum is σ = 254657571204. Its totient is φ = 169771714128.

The previous prime is 212214642569. The next prime is 212214642697. The reversal of 212214642665 is 566246412212.

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 100357171264 + 111857471401 = 316792^2 + 334451^2 .

It is a cyclic number.

It is not a de Polignac number, because 212214642665 - 2¹⁶ = 212214577129 is a prime.

It is a super-2 number, since 2×212214642665² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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, 21221464262 + ... + 21221464271.

It is an arithmetic number, because the mean of its divisors is an integer number (63664392801).

Almost surely, 2^212214642665 is an apocalyptic number.

It is an amenable number.

212214642665 is a deficient number, since it is larger than the sum of its proper divisors (42442928539).

212214642665 is an equidigital number, since it uses as much as digits as its factorization.

212214642665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42442928538.

The product of its digits is 276480, while the sum is 41.

The spelling of 212214642665 in words is "two hundred twelve billion, two hundred fourteen million, six hundred forty-two thousand, six hundred sixty-five".