418921421 has 2 divisors, whose sum is σ = 418921422. Its totient is φ = 418921420.

The previous prime is 418921411. The next prime is 418921499. The reversal of 418921421 is 124129814.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 400560196 + 18361225 = 20014^2 + 4285^2 .

It is a cyclic number.

It is not a de Polignac number, because 418921421 - 2²⁶ = 351812557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (418921411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 209460710 + 209460711.

It is an arithmetic number, because the mean of its divisors is an integer number (209460711).

Almost surely, 2^418921421 is an apocalyptic number.

It is an amenable number.

418921421 is a deficient number, since it is larger than the sum of its proper divisors (1).

418921421 is an equidigital number, since it uses as much as digits as its factorization.

418921421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 32.

The square root of 418921421 is about 20467.5699827801. The cubic root of 418921421 is about 748.2456304125.

The spelling of 418921421 in words is "four hundred eighteen million, nine hundred twenty-one thousand, four hundred twenty-one".