121000001 has 4 divisors (see below), whose sum is σ = 121064532. Its totient is φ = 120935472.

The previous prime is 120999997. The next prime is 121000003. The reversal of 121000001 is 100000121.

It is a happy number.

It is a Cunningham number, because it is equal to 11000²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 82373776 + 38626225 = 9076^2 + 6215^2 .

It is a cyclic number.

It is not a de Polignac number, because 121000001 - 2² = 120999997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121000003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29366 + ... + 33231.

It is an arithmetic number, because the mean of its divisors is an integer number (30266133).

Almost surely, 2^121000001 is an apocalyptic number.

It is an amenable number.

121000001 is a deficient number, since it is larger than the sum of its proper divisors (64531).

121000001 is an equidigital number, since it uses as much as digits as its factorization.

121000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64530.

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

The square root of 121000001 is about 11000.0000454545. Note that the first 4 decimals coincide. The cubic root of 121000001 is about 494.6087456874.

Adding to 121000001 its reverse (100000121), we get a palindrome (221000122).

The spelling of 121000001 in words is "one hundred twenty-one million, one", and thus it is an aban number.