21312231232211 has 2 divisors, whose sum is σ = 21312231232212. Its totient is φ = 21312231232210.

The previous prime is 21312231232183. The next prime is 21312231232213. The reversal of 21312231232211 is 11223213221312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21312231232211 - 2⁶ = 21312231232147 is a prime.

It is a super-2 number, since 2×21312231232211² (a number of 27 digits) contains 22 as substring.

Together with 21312231232213, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21312231232213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656115616105 + 10656115616106.

It is an arithmetic number, because the mean of its divisors is an integer number (10656115616106).

Almost surely, 2^{21312231232211} is an apocalyptic number.

21312231232211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21312231232211 is an equidigital number, since it uses as much as digits as its factorization.

21312231232211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

Adding to 21312231232211 its reverse (11223213221312), we get a palindrome (32535444453523).

The spelling of 21312231232211 in words is "twenty-one trillion, three hundred twelve billion, two hundred thirty-one million, two hundred thirty-two thousand, two hundred eleven".