21142230427 has 2 divisors, whose sum is σ = 21142230428. Its totient is φ = 21142230426.

The previous prime is 21142230337. The next prime is 21142230463. The reversal of 21142230427 is 72403224112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21142230427 - 2¹¹ = 21142228379 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21142230395 and 21142230404.

It is not a weakly prime, because it can be changed into another prime (21142230127) 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, 10571115213 + 10571115214.

It is an arithmetic number, because the mean of its divisors is an integer number (10571115214).

Almost surely, 2^21142230427 is an apocalyptic number.

21142230427 is a deficient number, since it is larger than the sum of its proper divisors (1).

21142230427 is an equidigital number, since it uses as much as digits as its factorization.

21142230427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 28.

Adding to 21142230427 its reverse (72403224112), we get a palindrome (93545454539).

The spelling of 21142230427 in words is "twenty-one billion, one hundred forty-two million, two hundred thirty thousand, four hundred twenty-seven".