404221001 has 8 divisors (see below), whose sum is σ = 412390440. Its totient is φ = 396132352.

The previous prime is 404220989. The next prime is 404221007. The reversal of 404221001 is 100122404.

It can be written as a sum of positive squares in 4 ways, for example, as 24010000 + 380211001 = 4900^2 + 19499^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404221001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (404221007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10040 + ... + 30153.

It is an arithmetic number, because the mean of its divisors is an integer number (51548805).

Almost surely, 2^404221001 is an apocalyptic number.

It is an amenable number.

404221001 is a deficient number, since it is larger than the sum of its proper divisors (8169439).

404221001 is a wasteful number, since it uses less digits than its factorization.

404221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40395.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 404221001 is about 20105.2480959574. The cubic root of 404221001 is about 739.3889532071.

Adding to 404221001 its reverse (100122404), we get a palindrome (504343405).

The spelling of 404221001 in words is "four hundred four million, two hundred twenty-one thousand, one".