21011101203 has 16 divisors (see below), whose sum is σ = 28720742400. Its totient is φ = 13654969920.

The previous prime is 21011101187. The next prime is 21011101207. The reversal of 21011101203 is 30210111012.

It is not a de Polignac number, because 21011101203 - 2⁴ = 21011101187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21011101207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90538 + ... + 224096.

It is an arithmetic number, because the mean of its divisors is an integer number (1795046400).

Almost surely, 2^21011101203 is an apocalyptic number.

21011101203 is a deficient number, since it is larger than the sum of its proper divisors (7709641197).

21011101203 is a wasteful number, since it uses less digits than its factorization.

21011101203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134882.

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

Adding to 21011101203 its reverse (30210111012), we get a palindrome (51221212215).

The spelling of 21011101203 in words is "twenty-one billion, eleven million, one hundred one thousand, two hundred three".