21233103211 has 4 divisors (see below), whose sum is σ = 21233544624. Its totient is φ = 21232661800.

The previous prime is 21233103181. The next prime is 21233103239. The reversal of 21233103211 is 11230133212.

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 21233103211 - 2¹⁹ = 21232578923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21233103011) 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, 138295 + ... + 248176.

It is an arithmetic number, because the mean of its divisors is an integer number (5308386156).

Almost surely, 2^21233103211 is an apocalyptic number.

21233103211 is a deficient number, since it is larger than the sum of its proper divisors (441413).

21233103211 is an equidigital number, since it uses as much as digits as its factorization.

21233103211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441412.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21233103211 its reverse (11230133212), we get a palindrome (32463236423).

The spelling of 21233103211 in words is "twenty-one billion, two hundred thirty-three million, one hundred three thousand, two hundred eleven".