100131223021 has 4 divisors (see below), whose sum is σ = 100568477500. Its totient is φ = 99693968544.

The previous prime is 100131223013. The next prime is 100131223063. The reversal of 100131223021 is 120322131001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120322131001 = 2503 ⋅48071167.

It can be written as a sum of positive squares in 2 ways, for example, as 65910292900 + 34220930121 = 256730^2 + 184989^2 .

It is a cyclic number.

It is not a de Polignac number, because 100131223021 - 2³ = 100131223013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100131222986 and 100131223004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100131223001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218626896 + ... + 218627353.

It is an arithmetic number, because the mean of its divisors is an integer number (25142119375).

Almost surely, 2^100131223021 is an apocalyptic number.

It is an amenable number.

100131223021 is a deficient number, since it is larger than the sum of its proper divisors (437254479).

100131223021 is an equidigital number, since it uses as much as digits as its factorization.

100131223021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437254478.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 100131223021 its reverse (120322131001), we get a palindrome (220453354022).

The spelling of 100131223021 in words is "one hundred billion, one hundred thirty-one million, two hundred twenty-three thousand, twenty-one".