421009219 has 4 divisors (see below), whose sum is σ = 421052544. Its totient is φ = 420965896.

The previous prime is 421009217. The next prime is 421009261. The reversal of 421009219 is 912900124.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 421009219 - 2¹ = 421009217 is a prime.

It is a super-2 number, since 2×421009219² = 354497524965979922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421009217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 414 + ... + 29020.

It is an arithmetic number, because the mean of its divisors is an integer number (105263136).

Almost surely, 2^421009219 is an apocalyptic number.

421009219 is a deficient number, since it is larger than the sum of its proper divisors (43325).

421009219 is a wasteful number, since it uses less digits than its factorization.

421009219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43324.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 421009219 is about 20518.5091807373. The cubic root of 421009219 is about 749.4865932241.

The spelling of 421009219 in words is "four hundred twenty-one million, nine thousand, two hundred nineteen".