21223211232211 has 4 divisors (see below), whose sum is σ = 21250178464552. Its totient is φ = 21196243999872.

The previous prime is 21223211232199. The next prime is 21223211232229. The reversal of 21223211232211 is 11223211232212.

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 21223211232211 - 2⁴¹ = 19024187976659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21223211236211) 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, 13483614990 + ... + 13483616563.

It is an arithmetic number, because the mean of its divisors is an integer number (5312544616138).

Almost surely, 2^{21223211232211} is an apocalyptic number.

21223211232211 is a deficient number, since it is larger than the sum of its proper divisors (26967232341).

21223211232211 is an equidigital number, since it uses as much as digits as its factorization.

21223211232211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26967232340.

The product of its digits is 1152, while the sum is 25.

Adding to 21223211232211 its reverse (11223211232212), we get a palindrome (32446422464423).

Subtracting from 21223211232211 its reverse (11223211232212), we obtain a palindrome (9999999999999).

The spelling of 21223211232211 in words is "twenty-one trillion, two hundred twenty-three billion, two hundred eleven million, two hundred thirty-two thousand, two hundred eleven".