4431121020421 has 8 divisors (see below), whose sum is σ = 4488701673600. Its totient is φ = 4373577630240.

The previous prime is 4431121020331. The next prime is 4431121020463. The reversal of 4431121020421 is 1240201211344.

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

It is a cyclic number.

It is not a de Polignac number, because 4431121020421 - 2²⁵ = 4431087465989 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 (4431121020721) 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, 9076336 + ... + 9552073.

It is an arithmetic number, because the mean of its divisors is an integer number (561087709200).

Almost surely, 2^{4431121020421} is an apocalyptic number.

It is an amenable number.

4431121020421 is a deficient number, since it is larger than the sum of its proper divisors (57580653179).

4431121020421 is a wasteful number, since it uses less digits than its factorization.

4431121020421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18631499.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 4431121020421 its reverse (1240201211344), we get a palindrome (5671322231765).

The spelling of 4431121020421 in words is "four trillion, four hundred thirty-one billion, one hundred twenty-one million, twenty thousand, four hundred twenty-one".