421815413 has 2 divisors, whose sum is σ = 421815414. Its totient is φ = 421815412.

The previous prime is 421815397. The next prime is 421815437. The reversal of 421815413 is 314518124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 391367089 + 30448324 = 19783^2 + 5518^2 .

It is a cyclic number.

It is not a de Polignac number, because 421815413 - 2⁴ = 421815397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421815463) 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, 210907706 + 210907707.

It is an arithmetic number, because the mean of its divisors is an integer number (210907707).

Almost surely, 2^421815413 is an apocalyptic number.

It is an amenable number.

421815413 is a deficient number, since it is larger than the sum of its proper divisors (1).

421815413 is an equidigital number, since it uses as much as digits as its factorization.

421815413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 29.

The square root of 421815413 is about 20538.1453154855. The cubic root of 421815413 is about 749.9646875226.

The spelling of 421815413 in words is "four hundred twenty-one million, eight hundred fifteen thousand, four hundred thirteen".