1200421171 has 2 divisors, whose sum is σ = 1200421172. Its totient is φ = 1200421170.

The previous prime is 1200421127. The next prime is 1200421213. The reversal of 1200421171 is 1711240021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1200421171 - 2¹⁹ = 1199896883 is a prime.

It is a super-2 number, since 2×1200421171² = 2882021975570022482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1200421471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600210585 + 600210586.

It is an arithmetic number, because the mean of its divisors is an integer number (600210586).

Almost surely, 2^1200421171 is an apocalyptic number.

1200421171 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200421171 is an equidigital number, since it uses as much as digits as its factorization.

1200421171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 1200421171 is about 34647.0946978242. The cubic root of 1200421171 is about 1062.7828771330.

Adding to 1200421171 its reverse (1711240021), we get a palindrome (2911661192).

The spelling of 1200421171 in words is "one billion, two hundred million, four hundred twenty-one thousand, one hundred seventy-one".