2121202022117 has 2 divisors, whose sum is σ = 2121202022118. Its totient is φ = 2121202022116.

The previous prime is 2121202022113. The next prime is 2121202022123. The reversal of 2121202022117 is 7112202021212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2086505136676 + 34696885441 = 1444474^2 + 186271^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121202022117 - 2² = 2121202022113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121202022092 and 2121202022101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121202022113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060601011058 + 1060601011059.

It is an arithmetic number, because the mean of its divisors is an integer number (1060601011059).

Almost surely, 2^{2121202022117} is an apocalyptic number.

It is an amenable number.

2121202022117 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121202022117 is an equidigital number, since it uses as much as digits as its factorization.

2121202022117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 23.

Adding to 2121202022117 its reverse (7112202021212), we get a palindrome (9233404043329).

The spelling of 2121202022117 in words is "two trillion, one hundred twenty-one billion, two hundred two million, twenty-two thousand, one hundred seventeen".