100131121123 has 4 divisors (see below), whose sum is σ = 109233950328. Its totient is φ = 91028291920.

The previous prime is 100131121081. The next prime is 100131121127. The reversal of 100131121123 is 321121131001.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 100131121123 - 2²¹ = 100129023971 is a prime.

It is a super-2 number, since 2×100131121123² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100131121097 and 100131121106.

It is not an unprimeable number, because it can be changed into a prime (100131121127) 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, 4551414586 + ... + 4551414607.

It is an arithmetic number, because the mean of its divisors is an integer number (27308487582).

Almost surely, 2^100131121123 is an apocalyptic number.

100131121123 is a deficient number, since it is larger than the sum of its proper divisors (9102829205).

100131121123 is an equidigital number, since it uses as much as digits as its factorization.

100131121123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9102829204.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 100131121123 its reverse (321121131001), we get a palindrome (421252252124).

The spelling of 100131121123 in words is "one hundred billion, one hundred thirty-one million, one hundred twenty-one thousand, one hundred twenty-three".