421312417 has 2 divisors, whose sum is σ = 421312418. Its totient is φ = 421312416.

The previous prime is 421312387. The next prime is 421312429. The reversal of 421312417 is 714213124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 421234576 + 77841 = 20524^2 + 279^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421312417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421312391 and 421312400.

It is not a weakly prime, because it can be changed into another prime (421312117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210656208 + 210656209.

It is an arithmetic number, because the mean of its divisors is an integer number (210656209).

Almost surely, 2^421312417 is an apocalyptic number.

It is an amenable number.

421312417 is a deficient number, since it is larger than the sum of its proper divisors (1).

421312417 is an equidigital number, since it uses as much as digits as its factorization.

421312417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 25.

The square root of 421312417 is about 20525.8962532699. The cubic root of 421312417 is about 749.6664691797. Note that the first 3 decimals are identical.

The spelling of 421312417 in words is "four hundred twenty-one million, three hundred twelve thousand, four hundred seventeen".