21113424427 has 2 divisors, whose sum is σ = 21113424428. Its totient is φ = 21113424426.

The previous prime is 21113424403. The next prime is 21113424457. The reversal of 21113424427 is 72442431112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21113424427 is a prime.

It is not a weakly prime, because it can be changed into another prime (21113424457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556712213 + 10556712214.

It is an arithmetic number, because the mean of its divisors is an integer number (10556712214).

Almost surely, 2^21113424427 is an apocalyptic number.

21113424427 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113424427 is an equidigital number, since it uses as much as digits as its factorization.

21113424427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 31.

Adding to 21113424427 its reverse (72442431112), we get a palindrome (93555855539).

The spelling of 21113424427 in words is "twenty-one billion, one hundred thirteen million, four hundred twenty-four thousand, four hundred twenty-seven".