421004421 has 12 divisors (see below), whose sum is σ = 608546848. Its totient is φ = 280471464.

The previous prime is 421004399. The next prime is 421004431. The reversal of 421004421 is 124400124.

It is not a de Polignac number, because 421004421 - 2¹³ = 420996229 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421004394 and 421004403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421004431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2425 + ... + 29118.

Almost surely, 2^421004421 is an apocalyptic number.

It is an amenable number.

421004421 is a deficient number, since it is larger than the sum of its proper divisors (187542427).

421004421 is a wasteful number, since it uses less digits than its factorization.

421004421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33032 (or 33029 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 421004421 is about 20518.3922615784. The cubic root of 421004421 is about 749.4837460574.

Adding to 421004421 its reverse (124400124), we get a palindrome (545404545).

The spelling of 421004421 in words is "four hundred twenty-one million, four thousand, four hundred twenty-one".