100431121434221 has 4 divisors (see below), whose sum is σ = 100445352859932. Its totient is φ = 100416890008512.

The previous prime is 100431121434211. The next prime is 100431121434233. The reversal of 100431121434221 is 122434121134001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 79588344712900 + 20842776721321 = 8921230^2 + 4565389^2 .

It is a cyclic number.

It is not a de Polignac number, because 100431121434221 - 2⁶ = 100431121434157 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 (100431121434211) 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, 7115702270 + ... + 7115716383.

It is an arithmetic number, because the mean of its divisors is an integer number (25111338214983).

Almost surely, 2^{100431121434221} is an apocalyptic number.

It is an amenable number.

100431121434221 is a deficient number, since it is larger than the sum of its proper divisors (14231425711).

100431121434221 is an equidigital number, since it uses as much as digits as its factorization.

100431121434221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14231425710.

The product of its (nonzero) digits is 4608, while the sum is 29.

Adding to 100431121434221 its reverse (122434121134001), we get a palindrome (222865242568222).

The spelling of 100431121434221 in words is "one hundred trillion, four hundred thirty-one billion, one hundred twenty-one million, four hundred thirty-four thousand, two hundred twenty-one".