21300018427 has 2 divisors, whose sum is σ = 21300018428. Its totient is φ = 21300018426.

The previous prime is 21300018409. The next prime is 21300018431. The reversal of 21300018427 is 72481000312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21300018427 - 2¹¹ = 21300016379 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21300018395 and 21300018404.

It is not a weakly prime, because it can be changed into another prime (21300018127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650009213 + 10650009214.

It is an arithmetic number, because the mean of its divisors is an integer number (10650009214).

Almost surely, 2^21300018427 is an apocalyptic number.

21300018427 is a deficient number, since it is larger than the sum of its proper divisors (1).

21300018427 is an equidigital number, since it uses as much as digits as its factorization.

21300018427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 28.

Adding to 21300018427 its reverse (72481000312), we get a palindrome (93781018739).

The spelling of 21300018427 in words is "twenty-one billion, three hundred million, eighteen thousand, four hundred twenty-seven".