21321233211 has 16 divisors (see below), whose sum is σ = 29941520000. Its totient is φ = 13458400128.

The previous prime is 21321233203. The next prime is 21321233233. The reversal of 21321233211 is 11233212312.

It is not a de Polignac number, because 21321233211 - 2³ = 21321233203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21321233201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3961 + ... + 206538.

It is an arithmetic number, because the mean of its divisors is an integer number (1871345000).

Almost surely, 2^21321233211 is an apocalyptic number.

21321233211 is a deficient number, since it is larger than the sum of its proper divisors (8620286789).

21321233211 is a wasteful number, since it uses less digits than its factorization.

21321233211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212298.

The product of its digits is 432, while the sum is 21.

Adding to 21321233211 its reverse (11233212312), we get a palindrome (32554445523).

The spelling of 21321233211 in words is "twenty-one billion, three hundred twenty-one million, two hundred thirty-three thousand, two hundred eleven".