21230232311 has 2 divisors, whose sum is σ = 21230232312. Its totient is φ = 21230232310.

The previous prime is 21230232307. The next prime is 21230232323. The reversal of 21230232311 is 11323203212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21230232311 - 2² = 21230232307 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21230232301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615116155 + 10615116156.

It is an arithmetic number, because the mean of its divisors is an integer number (10615116156).

Almost surely, 2^21230232311 is an apocalyptic number.

21230232311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230232311 is an equidigital number, since it uses as much as digits as its factorization.

21230232311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21230232311 its reverse (11323203212), we get a palindrome (32553435523).

The spelling of 21230232311 in words is "twenty-one billion, two hundred thirty million, two hundred thirty-two thousand, three hundred eleven".