21112011203 has 4 divisors (see below), whose sum is σ = 21138044088. Its totient is φ = 21085978320.

The previous prime is 21112011191. The next prime is 21112011287. The reversal of 21112011203 is 30211021112.

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 21112011203 - 2¹⁶ = 21111945667 is a prime.

It is a super-4 number, since 4×21112011203⁴ (a number of 42 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112013203) 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, 13015226 + ... + 13016847.

It is an arithmetic number, because the mean of its divisors is an integer number (5284511022).

Almost surely, 2^21112011203 is an apocalyptic number.

21112011203 is a deficient number, since it is larger than the sum of its proper divisors (26032885).

21112011203 is an equidigital number, since it uses as much as digits as its factorization.

21112011203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26032884.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21112011203 its reverse (30211021112), we get a palindrome (51323032315).

Subtracting 21112011203 from its reverse (30211021112), we obtain a palindrome (9099009909).

The spelling of 21112011203 in words is "twenty-one billion, one hundred twelve million, eleven thousand, two hundred three".