21231322211 has 16 divisors (see below), whose sum is σ = 24197378400. Its totient is φ = 18451104000.

The previous prime is 21231322193. The next prime is 21231322213. The reversal of 21231322211 is 11222313212.

It is a cyclic number.

It is not a de Polignac number, because 21231322211 - 2¹⁴ = 21231305827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21231322213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 297266 + ... + 361703.

It is an arithmetic number, because the mean of its divisors is an integer number (1512336150).

Almost surely, 2^21231322211 is an apocalyptic number.

21231322211 is a deficient number, since it is larger than the sum of its proper divisors (2966056189).

21231322211 is a wasteful number, since it uses less digits than its factorization.

21231322211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659110.

The product of its digits is 288, while the sum is 20.

Adding to 21231322211 its reverse (11222313212), we get a palindrome (32453635423).

The spelling of 21231322211 in words is "twenty-one billion, two hundred thirty-one million, three hundred twenty-two thousand, two hundred eleven".