404421213 has 64 divisors (see below), whose sum is σ = 684195840. Its totient is φ = 207168192.

The previous prime is 404421209. The next prime is 404421239. The reversal of 404421213 is 312124404.

It is not a de Polignac number, because 404421213 - 2² = 404421209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 404421213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404421203) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1165306 + ... + 1165652.

It is an arithmetic number, because the mean of its divisors is an integer number (10690560).

Almost surely, 2^404421213 is an apocalyptic number.

It is an amenable number.

404421213 is a deficient number, since it is larger than the sum of its proper divisors (279774627).

404421213 is a wasteful number, since it uses less digits than its factorization.

404421213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 404421213 is about 20110.2265775401. The cubic root of 404421213 is about 739.5110069902.

Adding to 404421213 its reverse (312124404), we get a palindrome (716545617).

The spelling of 404421213 in words is "four hundred four million, four hundred twenty-one thousand, two hundred thirteen".