21013000427 has 2 divisors, whose sum is σ = 21013000428. Its totient is φ = 21013000426.

The previous prime is 21013000363. The next prime is 21013000453. The reversal of 21013000427 is 72400031012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21013000427 - 2⁶ = 21013000363 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21013000399 and 21013000408.

It is not a weakly prime, because it can be changed into another prime (21013000927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506500213 + 10506500214.

It is an arithmetic number, because the mean of its divisors is an integer number (10506500214).

Almost surely, 2^21013000427 is an apocalyptic number.

21013000427 is a deficient number, since it is larger than the sum of its proper divisors (1).

21013000427 is an equidigital number, since it uses as much as digits as its factorization.

21013000427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 20.

Adding to 21013000427 its reverse (72400031012), we get a palindrome (93413031439).

The spelling of 21013000427 in words is "twenty-one billion, thirteen million, four hundred twenty-seven", and thus it is an aban number.