4123404244021 has 4 divisors (see below), whose sum is σ = 4127624720172. Its totient is φ = 4119183767872.

The previous prime is 4123404244007. The next prime is 4123404244027. The reversal of 4123404244021 is 1204424043214.

It is a happy number.

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 3417654716100 + 705749527921 = 1848690^2 + 840089^2 .

It is a cyclic number.

It is not a de Polignac number, because 4123404244021 - 2⁹ = 4123404243509 is a prime.

It is a super-2 number, since 2×4123404244021² (a number of 26 digits) 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 (4123404244027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2110236610 + ... + 2110238563.

It is an arithmetic number, because the mean of its divisors is an integer number (1031906180043).

Almost surely, 2^{4123404244021} is an apocalyptic number.

It is an amenable number.

4123404244021 is a deficient number, since it is larger than the sum of its proper divisors (4220476151).

4123404244021 is an equidigital number, since it uses as much as digits as its factorization.

4123404244021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4220476150.

The product of its (nonzero) digits is 24576, while the sum is 31.

Adding to 4123404244021 its reverse (1204424043214), we get a palindrome (5327828287235).

The spelling of 4123404244021 in words is "four trillion, one hundred twenty-three billion, four hundred four million, two hundred forty-four thousand, twenty-one".