2170121 has 2 divisors, whose sum is σ = 2170122. Its totient is φ = 2170120.

The previous prime is 2170117. The next prime is 2170127. The reversal of 2170121 is 1210712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1729225 + 440896 = 1315^2 + 664^2 .

It is a cyclic number.

It is not a de Polignac number, because 2170121 - 2² = 2170117 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2170096 and 2170105.

It is not a weakly prime, because it can be changed into another prime (2170127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085060 + 1085061.

It is an arithmetic number, because the mean of its divisors is an integer number (1085061).

2^2170121 is an apocalyptic number.

It is an amenable number.

2170121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2170121 is an equidigital number, since it uses as much as digits as its factorization.

2170121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 2170121 is about 1473.1330557692. The cubic root of 2170121 is about 129.4676653368.

Adding to 2170121 its reverse (1210712), we get a palindrome (3380833).

The spelling of 2170121 in words is "two million, one hundred seventy thousand, one hundred twenty-one".