21444464347 has 2 divisors, whose sum is σ = 21444464348. Its totient is φ = 21444464346.

The previous prime is 21444464317. The next prime is 21444464359. The reversal of 21444464347 is 74346444412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21444464347 is a prime.

It is a super-2 number, since 2×21444464347² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21444464317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10722232173 + 10722232174.

It is an arithmetic number, because the mean of its divisors is an integer number (10722232174).

Almost surely, 2^21444464347 is an apocalyptic number.

21444464347 is a deficient number, since it is larger than the sum of its proper divisors (1).

21444464347 is an equidigital number, since it uses as much as digits as its factorization.

21444464347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1032192, while the sum is 43.

The spelling of 21444464347 in words is "twenty-one billion, four hundred forty-four million, four hundred sixty-four thousand, three hundred forty-seven".