404021320421 has 8 divisors (see below), whose sum is σ = 407031754584. Its totient is φ = 401011776000.

The previous prime is 404021320411. The next prime is 404021320433. The reversal of 404021320421 is 124023120404.

It can be written as a sum of positive squares in 4 ways, for example, as 324570623521 + 79450696900 = 569711^2 + 281870^2 .

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-404021320421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404021320411) 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, 703421 + ... + 1141421.

It is an arithmetic number, because the mean of its divisors is an integer number (50878969323).

Almost surely, 2^404021320421 is an apocalyptic number.

It is an amenable number.

404021320421 is a deficient number, since it is larger than the sum of its proper divisors (3010434163).

404021320421 is a wasteful number, since it uses less digits than its factorization.

404021320421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444871.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 404021320421 its reverse (124023120404), we get a palindrome (528044440825).

The spelling of 404021320421 in words is "four hundred four billion, twenty-one million, three hundred twenty thousand, four hundred twenty-one".