121001 has 2 divisors, whose sum is σ = 121002. Its totient is φ = 121000.

The previous prime is 120997. The next prime is 121007. The reversal of 121001 is 100121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105625 + 15376 = 325^2 + 124^2 .

It is a cyclic number.

It is not a de Polignac number, because 121001 - 2² = 120997 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60500 + 60501.

It is an arithmetic number, because the mean of its divisors is an integer number (60501).

2¹²¹⁰⁰¹ is an apocalyptic number.

It is an amenable number.

121001 is a deficient number, since it is larger than the sum of its proper divisors (1).

121001 is an equidigital number, since it uses as much as digits as its factorization.

121001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 121001 is about 347.8519800145. The cubic root of 121001 is about 49.4610106880.

Adding to 121001 its reverse (100121), we get a palindrome (221122).

Multiplying 121001 by its reverse (100121), we get a palindrome (12114741121).

The spelling of 121001 in words is "one hundred twenty-one thousand, one", and thus it is an iban number.