21124232347 has 2 divisors, whose sum is σ = 21124232348. Its totient is φ = 21124232346.

The previous prime is 21124232341. The next prime is 21124232359. The reversal of 21124232347 is 74323242112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21124232347 is a prime.

It is a super-3 number, since 3×21124232347³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (21124232341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10562116173 + 10562116174.

It is an arithmetic number, because the mean of its divisors is an integer number (10562116174).

Almost surely, 2^21124232347 is an apocalyptic number.

21124232347 is a deficient number, since it is larger than the sum of its proper divisors (1).

21124232347 is an equidigital number, since it uses as much as digits as its factorization.

21124232347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 31.

Adding to 21124232347 its reverse (74323242112), we get a palindrome (95447474459).

The spelling of 21124232347 in words is "twenty-one billion, one hundred twenty-four million, two hundred thirty-two thousand, three hundred forty-seven".