100001221000123 has 4 divisors (see below), whose sum is σ = 100390330809720. Its totient is φ = 99612111190528.

The previous prime is 100001221000097. The next prime is 100001221000139. The reversal of 100001221000123 is 321000122100001.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100001221000123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100001225000123) 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, 194554904413 + ... + 194554904926.

It is an arithmetic number, because the mean of its divisors is an integer number (25097582702430).

Almost surely, 2^{100001221000123} is an apocalyptic number.

100001221000123 is a deficient number, since it is larger than the sum of its proper divisors (389109809597).

100001221000123 is an equidigital number, since it uses as much as digits as its factorization.

100001221000123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389109809596.

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

Adding to 100001221000123 its reverse (321000122100001), we get a palindrome (421001343100124).

The spelling of 100001221000123 in words is "one hundred trillion, one billion, two hundred twenty-one million, one hundred twenty-three", and thus it is an aban number.