21442312147 has 2 divisors, whose sum is σ = 21442312148. Its totient is φ = 21442312146.

The previous prime is 21442312091. The next prime is 21442312163. The reversal of 21442312147 is 74121324412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21442312147 - 2²⁷ = 21308094419 is a prime.

It is not a weakly prime, because it can be changed into another prime (21442312547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721156073 + 10721156074.

It is an arithmetic number, because the mean of its divisors is an integer number (10721156074).

Almost surely, 2^21442312147 is an apocalyptic number.

21442312147 is a deficient number, since it is larger than the sum of its proper divisors (1).

21442312147 is an equidigital number, since it uses as much as digits as its factorization.

21442312147 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21442312147 its reverse (74121324412), we get a palindrome (95563636559).

The spelling of 21442312147 in words is "twenty-one billion, four hundred forty-two million, three hundred twelve thousand, one hundred forty-seven".