1200000121 has 2 divisors, whose sum is σ = 1200000122. Its totient is φ = 1200000120.

The previous prime is 1200000101. The next prime is 1200000133. The reversal of 1200000121 is 1210000021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1011240000 + 188760121 = 31800^2 + 13739^2 .

It is an emirp because it is prime and its reverse (1210000021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1200000121 - 2⁷ = 1199999993 is a prime.

It is not a weakly prime, because it can be changed into another prime (1200000101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600000060 + 600000061.

It is an arithmetic number, because the mean of its divisors is an integer number (600000061).

Almost surely, 2^1200000121 is an apocalyptic number.

It is an amenable number.

1200000121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200000121 is an equidigital number, since it uses as much as digits as its factorization.

1200000121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 1200000121 is about 34641.0178978621. The cubic root of 1200000121 is about 1062.6586048997.

Adding to 1200000121 its reverse (1210000021), we get a palindrome (2410000142).

The spelling of 1200000121 in words is "one billion, two hundred million, one hundred twenty-one", and thus it is an aban number.