404021544534421 has 32 divisors (see below), whose sum is σ = 467881693119360. Its totient is φ = 345549295468800.

The previous prime is 404021544534383. The next prime is 404021544534427. The reversal of 404021544534421 is 124435445120404.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404021544534421 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 (404021544534427) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136446006 + ... + 139375591.

It is an arithmetic number, because the mean of its divisors is an integer number (14621302909980).

Almost surely, 2^{404021544534421} is an apocalyptic number.

It is an amenable number.

404021544534421 is a deficient number, since it is larger than the sum of its proper divisors (63860148584939).

404021544534421 is a wasteful number, since it uses less digits than its factorization.

404021544534421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275821765.

The product of its (nonzero) digits is 1228800, while the sum is 43.

Adding to 404021544534421 its reverse (124435445120404), we get a palindrome (528456989654825).

The spelling of 404021544534421 in words is "four hundred four trillion, twenty-one billion, five hundred forty-four million, five hundred thirty-four thousand, four hundred twenty-one".