100531254121 has 4 divisors (see below), whose sum is σ = 100532176272. Its totient is φ = 100530331972.

The previous prime is 100531254119. The next prime is 100531254137. The reversal of 100531254121 is 121452135001.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 121452135001 = 53 ⋅2291549717.

It is a cyclic number.

It is not a de Polignac number, because 100531254121 - 2¹ = 100531254119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100531254191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271591 + ... + 524236.

It is an arithmetic number, because the mean of its divisors is an integer number (25133044068).

Almost surely, 2^100531254121 is an apocalyptic number.

It is an amenable number.

100531254121 is a deficient number, since it is larger than the sum of its proper divisors (922151).

100531254121 is an equidigital number, since it uses as much as digits as its factorization.

100531254121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922150.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 100531254121 its reverse (121452135001), we get a palindrome (221983389122).

The spelling of 100531254121 in words is "one hundred billion, five hundred thirty-one million, two hundred fifty-four thousand, one hundred twenty-one".