21011102203 has 16 divisors (see below), whose sum is σ = 25863226816. Its totient is φ = 16621977600.

The previous prime is 21011102191. The next prime is 21011102219. The reversal of 21011102203 is 30220111012.

It is a cyclic number.

It is not a de Polignac number, because 21011102203 - 2⁵ = 21011102171 is a prime.

It is a super-2 number, since 2×21011102203² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (21011102803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1302475 + ... + 1318507.

It is an arithmetic number, because the mean of its divisors is an integer number (1616451676).

Almost surely, 2^21011102203 is an apocalyptic number.

21011102203 is a deficient number, since it is larger than the sum of its proper divisors (4852124613).

21011102203 is a wasteful number, since it uses less digits than its factorization.

21011102203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30454.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21011102203 its reverse (30220111012), we get a palindrome (51231213215).

The spelling of 21011102203 in words is "twenty-one billion, eleven million, one hundred two thousand, two hundred three".