2121102221177 has 2 divisors, whose sum is σ = 2121102221178. Its totient is φ = 2121102221176.

The previous prime is 2121102221153. The next prime is 2121102221233. The reversal of 2121102221177 is 7711222011212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1605038143801 + 516064077376 = 1266901^2 + 718376^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121102221177 - 2¹² = 2121102217081 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121102221377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060551110588 + 1060551110589.

It is an arithmetic number, because the mean of its divisors is an integer number (1060551110589).

Almost surely, 2^{2121102221177} is an apocalyptic number.

It is an amenable number.

2121102221177 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121102221177 is an equidigital number, since it uses as much as digits as its factorization.

2121102221177 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1568, while the sum is 29.

Adding to 2121102221177 its reverse (7711222011212), we get a palindrome (9832324232389).

The spelling of 2121102221177 in words is "two trillion, one hundred twenty-one billion, one hundred two million, two hundred twenty-one thousand, one hundred seventy-seven".