421339969 has 2 divisors, whose sum is σ = 421339970. Its totient is φ = 421339968.

The previous prime is 421339957. The next prime is 421340011. The reversal of 421339969 is 969933124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 335073025 + 86266944 = 18305^2 + 9288^2 .

It is a cyclic number.

It is not a de Polignac number, because 421339969 - 2¹¹ = 421337921 is a prime.

It is a super-2 number, since 2×421339969² = 355054738953841922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (421339949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210669984 + 210669985.

It is an arithmetic number, because the mean of its divisors is an integer number (210669985).

Almost surely, 2^421339969 is an apocalyptic number.

It is an amenable number.

421339969 is a deficient number, since it is larger than the sum of its proper divisors (1).

421339969 is an equidigital number, since it uses as much as digits as its factorization.

421339969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928, while the sum is 46.

The square root of 421339969 is about 20526.5673944768. The cubic root of 421339969 is about 749.6828104659.

The spelling of 421339969 in words is "four hundred twenty-one million, three hundred thirty-nine thousand, nine hundred sixty-nine".