21211102203 has 4 divisors (see below), whose sum is σ = 28281469608. Its totient is φ = 14140734800.

The previous prime is 21211102141. The next prime is 21211102217. The reversal of 21211102203 is 30220111212.

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 21211102203 - 2¹⁸ = 21210840059 is a prime.

It is a super-2 number, since 2×21211102203² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21211102223) 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, 3535183698 + ... + 3535183703.

It is an arithmetic number, because the mean of its divisors is an integer number (7070367402).

Almost surely, 2^21211102203 is an apocalyptic number.

21211102203 is a deficient number, since it is larger than the sum of its proper divisors (7070367405).

21211102203 is an equidigital number, since it uses as much as digits as its factorization.

21211102203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7070367404.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21211102203 its reverse (30220111212), we get a palindrome (51431213415).

Subtracting 21211102203 from its reverse (30220111212), we obtain a palindrome (9009009009).

The spelling of 21211102203 in words is "twenty-one billion, two hundred eleven million, one hundred two thousand, two hundred three".