421335121 has 2 divisors, whose sum is σ = 421335122. Its totient is φ = 421335120.

The previous prime is 421335097. The next prime is 421335133. The reversal of 421335121 is 121533124.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 350101521 + 71233600 = 18711^2 + 8440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421335121 is a prime.

It is equal to p_22411723 and since 421335121 and 22411723 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 = 421335092 and 421335101.

It is not a weakly prime, because it can be changed into another prime (421335181) 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, 210667560 + 210667561.

It is an arithmetic number, because the mean of its divisors is an integer number (210667561).

Almost surely, 2^421335121 is an apocalyptic number.

It is an amenable number.

421335121 is a deficient number, since it is larger than the sum of its proper divisors (1).

421335121 is an equidigital number, since it uses as much as digits as its factorization.

421335121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 22.

The square root of 421335121 is about 20526.4493032770. The cubic root of 421335121 is about 749.6799351344.

Adding to 421335121 its reverse (121533124), we get a palindrome (542868245).

The spelling of 421335121 in words is "four hundred twenty-one million, three hundred thirty-five thousand, one hundred twenty-one".