100020203123 has 16 divisors (see below), whose sum is σ = 106498022400. Its totient is φ = 93664359360.

The previous prime is 100020203117. The next prime is 100020203147. The reversal of 100020203123 is 321302020001.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100020203123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100020203098 and 100020203107.

It is not an unprimeable number, because it can be changed into a prime (100020503123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8230790 + ... + 8242932.

It is an arithmetic number, because the mean of its divisors is an integer number (6656126400).

Almost surely, 2^100020203123 is an apocalyptic number.

100020203123 is a deficient number, since it is larger than the sum of its proper divisors (6477819277).

100020203123 is a wasteful number, since it uses less digits than its factorization.

100020203123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17122.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 100020203123 its reverse (321302020001), we get a palindrome (421322223124).

The spelling of 100020203123 in words is "one hundred billion, twenty million, two hundred three thousand, one hundred twenty-three".