420550121 has 2 divisors, whose sum is σ = 420550122. Its totient is φ = 420550120.

The previous prime is 420550093. The next prime is 420550129. The reversal of 420550121 is 121055024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 262796521 + 157753600 = 16211^2 + 12560^2 .

It is a cyclic number.

It is not a de Polignac number, because 420550121 - 2⁶ = 420550057 is a prime.

It is a super-2 number, since 2×420550121² = 353724808546229282, which contains 22 as substring.

It is equal to p_22372202 and since 420550121 and 22372202 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 420550093 and 420550102.

It is not a weakly prime, because it can be changed into another prime (420550129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210275060 + 210275061.

It is an arithmetic number, because the mean of its divisors is an integer number (210275061).

Almost surely, 2^420550121 is an apocalyptic number.

It is an amenable number.

420550121 is a deficient number, since it is larger than the sum of its proper divisors (1).

420550121 is an equidigital number, since it uses as much as digits as its factorization.

420550121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 420550121 is about 20507.3187179602. The cubic root of 420550121 is about 749.2140632107.

The spelling of 420550121 in words is "four hundred twenty million, five hundred fifty thousand, one hundred twenty-one".