211120202211661 has 2 divisors, whose sum is σ = 211120202211662. Its totient is φ = 211120202211660.

The previous prime is 211120202211629. The next prime is 211120202211701. The reversal of 211120202211661 is 166112202021112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142034099853636 + 69086102358025 = 11917806^2 + 8311805^2 .

It is a cyclic number.

It is not a de Polignac number, because 211120202211661 - 2⁵ = 211120202211629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211120202011661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105560101105830 + 105560101105831.

It is an arithmetic number, because the mean of its divisors is an integer number (105560101105831).

Almost surely, 2^{211120202211661} is an apocalyptic number.

It is an amenable number.

211120202211661 is a deficient number, since it is larger than the sum of its proper divisors (1).

211120202211661 is an equidigital number, since it uses as much as digits as its factorization.

211120202211661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 28.

Adding to 211120202211661 its reverse (166112202021112), we get a palindrome (377232404232773).

The spelling of 211120202211661 in words is "two hundred eleven trillion, one hundred twenty billion, two hundred two million, two hundred eleven thousand, six hundred sixty-one".