4023020320421 has 4 divisors (see below), whose sum is σ = 4064494756812. Its totient is φ = 3981545884032.

The previous prime is 4023020320409. The next prime is 4023020320441. The reversal of 4023020320421 is 1240230203204.

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 1237589500900 + 2785430819521 = 1112470^2 + 1668961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4023020320421 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 (4023020320441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20737218050 + ... + 20737218243.

It is an arithmetic number, because the mean of its divisors is an integer number (1016123689203).

Almost surely, 2^{4023020320421} is an apocalyptic number.

It is an amenable number.

4023020320421 is a deficient number, since it is larger than the sum of its proper divisors (41474436391).

4023020320421 is an equidigital number, since it uses as much as digits as its factorization.

4023020320421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41474436390.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 4023020320421 its reverse (1240230203204), we get a palindrome (5263250523625).

The spelling of 4023020320421 in words is "four trillion, twenty-three billion, twenty million, three hundred twenty thousand, four hundred twenty-one".