8432621838721 has 4 divisors (see below), whose sum is σ = 8472586871344. Its totient is φ = 8392656806100.

The previous prime is 8432621838713. The next prime is 8432621838731. The reversal of 8432621838721 is 1278381262348.

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 8432621838721 - 2³ = 8432621838713 is a prime.

It is a super-2 number, since 2×8432621838721² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8432621838731) 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, 19982515995 + ... + 19982516416.

It is an arithmetic number, because the mean of its divisors is an integer number (2118146717836).

Almost surely, 2^{8432621838721} is an apocalyptic number.

It is an amenable number.

8432621838721 is a deficient number, since it is larger than the sum of its proper divisors (39965032623).

8432621838721 is a wasteful number, since it uses less digits than its factorization.

8432621838721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39965032622.

The product of its digits is 6193152, while the sum is 55.

The spelling of 8432621838721 in words is "eight trillion, four hundred thirty-two billion, six hundred twenty-one million, eight hundred thirty-eight thousand, seven hundred twenty-one".