2100121 has 2 divisors, whose sum is σ = 2100122.
Its totient is φ = 2100120.
The previous prime is 2100113. The next prime is 2100167. The reversal of 2100121 is 1210012.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 2062096 + 38025 = 1436^2 + 195^2
It is a cyclic number.
It is not a de Polignac number, because 2100121 - 23 = 2100113 is a prime.
It is not a weakly prime, because it can be changed into another prime (2100181) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050060 + 1050061.
It is an arithmetic number, because the mean of its divisors is an integer number (1050061).
22100121 is an apocalyptic number.
It is an amenable number.
2100121 is a deficient number, since it is larger than the sum of its proper divisors (1).
2100121 is an equidigital number, since it uses as much as digits as its factorization.
2100121 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 4, while the sum is 7.
The square root of 2100121 is about 1449.1794229839.
The cubic root of 2100121 is about 128.0603759766.
Adding to 2100121 its reverse (1210012), we get a palindrome (3310133).
The spelling of 2100121 in words is "two million, one hundred thousand, one hundred twenty-one".