4405354020421 has 4 divisors (see below), whose sum is σ = 4407027154092. Its totient is φ = 4403680886752.

The previous prime is 4405354020377. The next prime is 4405354020433. The reversal of 4405354020421 is 1240204535044.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3004030769796 + 1401323250625 = 1733214^2 + 1183775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4405354020421 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 (4405354020721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 836562886 + ... + 836568151.

It is an arithmetic number, because the mean of its divisors is an integer number (1101756788523).

Almost surely, 2^{4405354020421} is an apocalyptic number.

It is an amenable number.

4405354020421 is a deficient number, since it is larger than the sum of its proper divisors (1673133671).

4405354020421 is a wasteful number, since it uses less digits than its factorization.

4405354020421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1673133670.

The product of its (nonzero) digits is 76800, while the sum is 34.

Adding to 4405354020421 its reverse (1240204535044), we get a palindrome (5645558555465).

The spelling of 4405354020421 in words is "four trillion, four hundred five billion, three hundred fifty-four million, twenty thousand, four hundred twenty-one".