2212010635661 has 4 divisors (see below), whose sum is σ = 2242312151292. Its totient is φ = 2181709120032.

The previous prime is 2212010635631. The next prime is 2212010635673. The reversal of 2212010635661 is 1665360102122.

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 1661698886761 + 550311748900 = 1289069^2 + 741830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2212010635661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2212010635631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15150757706 + ... + 15150757851.

It is an arithmetic number, because the mean of its divisors is an integer number (560578037823).

Almost surely, 2^{2212010635661} is an apocalyptic number.

It is an amenable number.

2212010635661 is a deficient number, since it is larger than the sum of its proper divisors (30301515631).

2212010635661 is an equidigital number, since it uses as much as digits as its factorization.

2212010635661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30301515630.

The product of its (nonzero) digits is 25920, while the sum is 35.

Adding to 2212010635661 its reverse (1665360102122), we get a palindrome (3877370737783).

The spelling of 2212010635661 in words is "two trillion, two hundred twelve billion, ten million, six hundred thirty-five thousand, six hundred sixty-one".