424208921 has 4 divisors (see below), whose sum is σ = 424343844. Its totient is φ = 424074000.

The previous prime is 424208881. The next prime is 424208927. The reversal of 424208921 is 129802424.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 257153296 + 167055625 = 16036^2 + 12925^2 .

It is a cyclic number.

It is not a de Polignac number, because 424208921 - 2²⁶ = 357100057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (424208927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62630 + ... + 69071.

It is an arithmetic number, because the mean of its divisors is an integer number (106085961).

Almost surely, 2^424208921 is an apocalyptic number.

It is an amenable number.

424208921 is a deficient number, since it is larger than the sum of its proper divisors (134923).

424208921 is a wasteful number, since it uses less digits than its factorization.

424208921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134922.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 424208921 is about 20596.3327075477. The cubic root of 424208921 is about 751.3805216172.

The spelling of 424208921 in words is "four hundred twenty-four million, two hundred eight thousand, nine hundred twenty-one".