20191009100203 has 8 divisors (see below), whose sum is σ = 21506731781472. Its totient is φ = 18889510448256.

The previous prime is 20191009100191. The next prime is 20191009100243. The reversal of 20191009100203 is 30200190019102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20191009100203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20191009100243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3556004400 + ... + 3556010077.

It is an arithmetic number, because the mean of its divisors is an integer number (2688341472684).

Almost surely, 2^{20191009100203} is an apocalyptic number.

20191009100203 is a deficient number, since it is larger than the sum of its proper divisors (1315722681269).

20191009100203 is a wasteful number, since it uses less digits than its factorization.

20191009100203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7112014661.

The product of its (nonzero) digits is 972, while the sum is 28.

Adding to 20191009100203 its reverse (30200190019102), we get a palindrome (50391199119305).

The spelling of 20191009100203 in words is "twenty trillion, one hundred ninety-one billion, nine million, one hundred thousand, two hundred three".