421569919 has 2 divisors, whose sum is σ = 421569920. Its totient is φ = 421569918.

The previous prime is 421569917. The next prime is 421569923. The reversal of 421569919 is 919965124.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421569919 - 2¹ = 421569917 is a prime.

It is a super-2 number, since 2×421569919² = 355442393211333122, which contains 22 as substring.

Together with 421569917, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421569917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210784959 + 210784960.

It is an arithmetic number, because the mean of its divisors is an integer number (210784960).

Almost surely, 2^421569919 is an apocalyptic number.

421569919 is a deficient number, since it is larger than the sum of its proper divisors (1).

421569919 is an equidigital number, since it uses as much as digits as its factorization.

421569919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 46.

The square root of 421569919 is about 20532.1679079439. The cubic root of 421569919 is about 749.8191676623.

The spelling of 421569919 in words is "four hundred twenty-one million, five hundred sixty-nine thousand, nine hundred nineteen".