2111022021161 has 2 divisors, whose sum is σ = 2111022021162. Its totient is φ = 2111022021160.

The previous prime is 2111022021149. The next prime is 2111022021233. The reversal of 2111022021161 is 1611202201112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2096903828761 + 14118192400 = 1448069^2 + 118820^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111022021161 - 2¹⁸ = 2111021759017 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2111022021061) by changing a digit.

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 as a sum of consecutive naturals, namely, 1055511010580 + 1055511010581.

It is an arithmetic number, because the mean of its divisors is an integer number (1055511010581).

Almost surely, 2^{2111022021161} is an apocalyptic number.

It is an amenable number.

2111022021161 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111022021161 is an equidigital number, since it uses as much as digits as its factorization.

2111022021161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 2111022021161 its reverse (1611202201112), we get a palindrome (3722224222273).

The spelling of 2111022021161 in words is "two trillion, one hundred eleven billion, twenty-two million, twenty-one thousand, one hundred sixty-one".