100120203 has 6 divisors (see below), whose sum is σ = 144618084. Its totient is φ = 66746796.

The previous prime is 100120183. The next prime is 100120213. The reversal of 100120203 is 302021001.

It is a happy number.

It is not a de Polignac number, because 100120203 - 2⁸ = 100119947 is a prime.

It is a super-2 number, since 2×100120203² = 20048110097522418, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 11124467 = 100120203 / (1 + 0 + 0 + 1 + 2 + 0 + 2 + 0 + 3).

It is not an unprimeable number, because it can be changed into a prime (100120213) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5562225 + ... + 5562242.

It is an arithmetic number, because the mean of its divisors is an integer number (24103014).

Almost surely, 2^100120203 is an apocalyptic number.

100120203 is a deficient number, since it is larger than the sum of its proper divisors (44497881).

100120203 is a wasteful number, since it uses less digits than its factorization.

100120203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11124473 (or 11124470 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 100120203 is about 10006.0083449895. The cubic root of 100120203 is about 464.3447865283.

Adding to 100120203 its reverse (302021001), we get a palindrome (402141204).

The spelling of 100120203 in words is "one hundred million, one hundred twenty thousand, two hundred three".