21432241427 has 2 divisors, whose sum is σ = 21432241428. Its totient is φ = 21432241426.

The previous prime is 21432241387. The next prime is 21432241451. The reversal of 21432241427 is 72414223412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21432241427 - 2²⁴ = 21415464211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21432241393 and 21432241402.

It is not a weakly prime, because it can be changed into another prime (21432241487) 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, 10716120713 + 10716120714.

It is an arithmetic number, because the mean of its divisors is an integer number (10716120714).

Almost surely, 2^21432241427 is an apocalyptic number.

21432241427 is a deficient number, since it is larger than the sum of its proper divisors (1).

21432241427 is an equidigital number, since it uses as much as digits as its factorization.

21432241427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21504, while the sum is 32.

Adding to 21432241427 its reverse (72414223412), we get a palindrome (93846464839).

The spelling of 21432241427 in words is "twenty-one billion, four hundred thirty-two million, two hundred forty-one thousand, four hundred twenty-seven".