421866869 has 2 divisors, whose sum is σ = 421866870. Its totient is φ = 421866868.

The previous prime is 421866833. The next prime is 421866919. The reversal of 421866869 is 968668124.

It is a happy number.

It is an a-pointer prime, because the next prime (421866919) can be obtained adding 421866869 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 419020900 + 2845969 = 20470^2 + 1687^2 .

It is a cyclic number.

It is not a de Polignac number, because 421866869 - 2¹² = 421862773 is a prime.

It is a super-2 number, since 2×421866869² = 355943310319726322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421866469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210933434 + 210933435.

It is an arithmetic number, because the mean of its divisors is an integer number (210933435).

Almost surely, 2^421866869 is an apocalyptic number.

It is an amenable number.

421866869 is a deficient number, since it is larger than the sum of its proper divisors (1).

421866869 is an equidigital number, since it uses as much as digits as its factorization.

421866869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 995328, while the sum is 50.

The square root of 421866869 is about 20539.3979707293. The cubic root of 421866869 is about 749.9951815987.

The spelling of 421866869 in words is "four hundred twenty-one million, eight hundred sixty-six thousand, eight hundred sixty-nine".