100120021123 has 4 divisors (see below), whose sum is σ = 100127160648. Its totient is φ = 100112881600.

The previous prime is 100120021097. The next prime is 100120021139. The reversal of 100120021123 is 321120021001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321120021001 = 13 ⋅24701540077.

It is a cyclic number.

It is not a de Polignac number, because 100120021123 - 2²⁵ = 100086466691 is a prime.

It is a super-2 number, since 2×100120021123² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100120021163) 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, 3548686 + ... + 3576787.

It is an arithmetic number, because the mean of its divisors is an integer number (25031790162).

Almost surely, 2^100120021123 is an apocalyptic number.

100120021123 is a deficient number, since it is larger than the sum of its proper divisors (7139525).

100120021123 is an equidigital number, since it uses as much as digits as its factorization.

100120021123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7139524.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 100120021123 its reverse (321120021001), we get a palindrome (421240042124).

The spelling of 100120021123 in words is "one hundred billion, one hundred twenty million, twenty-one thousand, one hundred twenty-three".