2180110110821 has 2 divisors, whose sum is σ = 2180110110822. Its totient is φ = 2180110110820.

The previous prime is 2180110110797. The next prime is 2180110110833. The reversal of 2180110110821 is 1280110110812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1629998637796 + 550111473025 = 1276714^2 + 741695^2 .

It is a cyclic number.

It is not a de Polignac number, because 2180110110821 - 2¹⁰ = 2180110109797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2180110110881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090055055410 + 1090055055411.

It is an arithmetic number, because the mean of its divisors is an integer number (1090055055411).

Almost surely, 2^{2180110110821} is an apocalyptic number.

It is an amenable number.

2180110110821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2180110110821 is an equidigital number, since it uses as much as digits as its factorization.

2180110110821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 26.

Subtracting from 2180110110821 its reverse (1280110110812), we obtain a palindrome (900000000009).

The spelling of 2180110110821 in words is "two trillion, one hundred eighty billion, one hundred ten million, one hundred ten thousand, eight hundred twenty-one".