21100011203 has 4 divisors (see below), whose sum is σ = 21445913088. Its totient is φ = 20754109320.

The previous prime is 21100011161. The next prime is 21100011209. The reversal of 21100011203 is 30211000112.

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 21100011203 - 2¹⁶ = 21099945667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21100011209) 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, 172950851 + ... + 172950972.

It is an arithmetic number, because the mean of its divisors is an integer number (5361478272).

Almost surely, 2^21100011203 is an apocalyptic number.

21100011203 is a deficient number, since it is larger than the sum of its proper divisors (345901885).

21100011203 is an equidigital number, since it uses as much as digits as its factorization.

21100011203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345901884.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21100011203 its reverse (30211000112), we get a palindrome (51311011315).

The spelling of 21100011203 in words is "twenty-one billion, one hundred million, eleven thousand, two hundred three".