420234121 has 2 divisors, whose sum is σ = 420234122. Its totient is φ = 420234120.

The previous prime is 420234119. The next prime is 420234137. The reversal of 420234121 is 121432024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 304886521 + 115347600 = 17461^2 + 10740^2 .

It is a cyclic number.

It is not a de Polignac number, because 420234121 - 2¹ = 420234119 is a prime.

Together with 420234119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (420234151) 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 as a sum of consecutive naturals, namely, 210117060 + 210117061.

It is an arithmetic number, because the mean of its divisors is an integer number (210117061).

Almost surely, 2^420234121 is an apocalyptic number.

It is an amenable number.

420234121 is a deficient number, since it is larger than the sum of its proper divisors (1).

420234121 is an equidigital number, since it uses as much as digits as its factorization.

420234121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 420234121 is about 20499.6127036586. The cubic root of 420234121 is about 749.0263638497.

Adding to 420234121 its reverse (121432024), we get a palindrome (541666145).

The spelling of 420234121 in words is "four hundred twenty million, two hundred thirty-four thousand, one hundred twenty-one".