21223232311 has 2 divisors, whose sum is σ = 21223232312. Its totient is φ = 21223232310.

The previous prime is 21223232309. The next prime is 21223232347. The reversal of 21223232311 is 11323232212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21223232311 - 2¹ = 21223232309 is a prime.

It is a super-5 number, since 5×21223232311⁵ (a number of 53 digits) contains 55555 as substring.

Together with 21223232309, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21223232011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611616155 + 10611616156.

It is an arithmetic number, because the mean of its divisors is an integer number (10611616156).

Almost surely, 2^21223232311 is an apocalyptic number.

21223232311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223232311 is an equidigital number, since it uses as much as digits as its factorization.

21223232311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 22.

Adding to 21223232311 its reverse (11323232212), we get a palindrome (32546464523).

Subtracting from 21223232311 its reverse (11323232212), we obtain a palindrome (9900000099).

The spelling of 21223232311 in words is "twenty-one billion, two hundred twenty-three million, two hundred thirty-two thousand, three hundred eleven".