21124232231 has 2 divisors, whose sum is σ = 21124232232. Its totient is φ = 21124232230.

The previous prime is 21124232209. The next prime is 21124232299. The reversal of 21124232231 is 13223242112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21124232231 - 2¹⁰ = 21124231207 is a prime.

It is a super-2 number, since 2×21124232231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21124232197 and 21124232206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21124232131) 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 as a sum of consecutive naturals, namely, 10562116115 + 10562116116.

It is an arithmetic number, because the mean of its divisors is an integer number (10562116116).

Almost surely, 2^21124232231 is an apocalyptic number.

21124232231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21124232231 is an equidigital number, since it uses as much as digits as its factorization.

21124232231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 23.

Adding to 21124232231 its reverse (13223242112), we get a palindrome (34347474343).

The spelling of 21124232231 in words is "twenty-one billion, one hundred twenty-four million, two hundred thirty-two thousand, two hundred thirty-one".