4021444432421 has 8 divisors (see below), whose sum is σ = 4354713310584. Its totient is φ = 3691593696960.

The previous prime is 4021444432391. The next prime is 4021444432429. The reversal of 4021444432421 is 1242344441204.

It can be written as a sum of positive squares in 4 ways, for example, as 97237948900 + 3924206483521 = 311830^2 + 1980961^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4021444432421 - 2¹⁰ = 4021444431397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021444432429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 854533226 + ... + 854537931.

It is an arithmetic number, because the mean of its divisors is an integer number (544339163823).

Almost surely, 2^{4021444432421} is an apocalyptic number.

It is an amenable number.

4021444432421 is a deficient number, since it is larger than the sum of its proper divisors (333268878163).

4021444432421 is a wasteful number, since it uses less digits than its factorization.

4021444432421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1709071351.

The product of its (nonzero) digits is 98304, while the sum is 35.

Adding to 4021444432421 its reverse (1242344441204), we get a palindrome (5263788873625).

The spelling of 4021444432421 in words is "four trillion, twenty-one billion, four hundred forty-four million, four hundred thirty-two thousand, four hundred twenty-one".