8428721234421 has 16 divisors (see below), whose sum is σ = 11731568434560. Its totient is φ = 5372704592640.

The previous prime is 8428721234383. The next prime is 8428721234431. The reversal of 8428721234421 is 1244321278248.

It is not a de Polignac number, because 8428721234421 - 2⁹ = 8428721233909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8428721234431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24053616 + ... + 24401513.

It is an arithmetic number, because the mean of its divisors is an integer number (733223027160).

Almost surely, 2^{8428721234421} is an apocalyptic number.

It is an amenable number.

8428721234421 is a deficient number, since it is larger than the sum of its proper divisors (3302847200139).

8428721234421 is a wasteful number, since it uses less digits than its factorization.

8428721234421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48457676.

The product of its digits is 1376256, while the sum is 48.

The spelling of 8428721234421 in words is "eight trillion, four hundred twenty-eight billion, seven hundred twenty-one million, two hundred thirty-four thousand, four hundred twenty-one".