4021444421021 has 4 divisors (see below), whose sum is σ = 4021457181600. Its totient is φ = 4021431660444.

The previous prime is 4021444421017. The next prime is 4021444421023. The reversal of 4021444421021 is 1201244441204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4021444421021 - 2² = 4021444421017 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 (4021444421023) 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, 5895281 + ... + 6541958.

It is an arithmetic number, because the mean of its divisors is an integer number (1005364295400).

Almost surely, 2^{4021444421021} is an apocalyptic number.

It is an amenable number.

4021444421021 is a deficient number, since it is larger than the sum of its proper divisors (12760579).

4021444421021 is a wasteful number, since it uses less digits than its factorization.

4021444421021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12760578.

The product of its (nonzero) digits is 8192, while the sum is 29.

Adding to 4021444421021 its reverse (1201244441204), we get a palindrome (5222688862225).

The spelling of 4021444421021 in words is "four trillion, twenty-one billion, four hundred forty-four million, four hundred twenty-one thousand, twenty-one".