421085669 has 2 divisors, whose sum is σ = 421085670. Its totient is φ = 421085668.

The previous prime is 421085569. The next prime is 421085677. The reversal of 421085669 is 966580124.

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., 420783169 + 302500 = 20513^2 + 550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421085669 is a prime.

It is a super-2 number, since 2×421085669² = 354626281274355122, which contains 22 as substring.

It is a Chen prime.

It is equal to p_22399187 and since 421085669 and 22399187 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421085569) 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, 210542834 + 210542835.

It is an arithmetic number, because the mean of its divisors is an integer number (210542835).

Almost surely, 2^421085669 is an apocalyptic number.

It is an amenable number.

421085669 is a deficient number, since it is larger than the sum of its proper divisors (1).

421085669 is an equidigital number, since it uses as much as digits as its factorization.

421085669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 421085669 is about 20520.3720482841. The cubic root of 421085669 is about 749.5319562705.

The spelling of 421085669 in words is "four hundred twenty-one million, eighty-five thousand, six hundred sixty-nine".