100203421421123 has 4 divisors (see below), whose sum is σ = 100210597788408. Its totient is φ = 100196245053840.

The previous prime is 100203421421093. The next prime is 100203421421177. The reversal of 100203421421123 is 321124124302001.

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 100203421421123 - 2¹⁰ = 100203421420099 is a prime.

It is a super-2 number, since 2×100203421421123² (a number of 29 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 = 100203421421092 and 100203421421101.

It is not an unprimeable number, because it can be changed into a prime (100203421421183) 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, 3588162698 + ... + 3588190623.

It is an arithmetic number, because the mean of its divisors is an integer number (25052649447102).

Almost surely, 2^{100203421421123} is an apocalyptic number.

100203421421123 is a deficient number, since it is larger than the sum of its proper divisors (7176367285).

100203421421123 is an equidigital number, since it uses as much as digits as its factorization.

100203421421123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7176367284.

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 100203421421123 its reverse (321124124302001), we get a palindrome (421327545723124).

The spelling of 100203421421123 in words is "one hundred trillion, two hundred three billion, four hundred twenty-one million, four hundred twenty-one thousand, one hundred twenty-three".