404202421 has 24 divisors (see below), whose sum is σ = 499288536. Its totient is φ = 325140480.

The previous prime is 404202419. The next prime is 404202427. The reversal of 404202421 is 124202404.

It can be written as a sum of positive squares in 4 ways, for example, as 221682321 + 182520100 = 14889^2 + 13510^2 .

It is not a de Polignac number, because 404202421 - 2¹ = 404202419 is a prime.

It is a super-2 number, since 2×404202421² = 326759194284522482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404202427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 533575 + ... + 534331.

It is an arithmetic number, because the mean of its divisors is an integer number (20803689).

Almost surely, 2^404202421 is an apocalyptic number.

It is an amenable number.

404202421 is a deficient number, since it is larger than the sum of its proper divisors (95086115).

404202421 is a wasteful number, since it uses less digits than its factorization.

404202421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1429 (or 1422 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 404202421 is about 20104.7860222386. The cubic root of 404202421 is about 739.3776243736.

Adding to 404202421 its reverse (124202404), we get a palindrome (528404825).

The spelling of 404202421 in words is "four hundred four million, two hundred two thousand, four hundred twenty-one".