21444140407 has 2 divisors, whose sum is σ = 21444140408. Its totient is φ = 21444140406.

The previous prime is 21444140387. The next prime is 21444140441. The reversal of 21444140407 is 70404144412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21444140407 - 2⁷ = 21444140279 is a prime.

It is a super-3 number, since 3×21444140407³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21444140467) 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, 10722070203 + 10722070204.

It is an arithmetic number, because the mean of its divisors is an integer number (10722070204).

Almost surely, 2^21444140407 is an apocalyptic number.

21444140407 is a deficient number, since it is larger than the sum of its proper divisors (1).

21444140407 is an equidigital number, since it uses as much as digits as its factorization.

21444140407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14336, while the sum is 31.

Adding to 21444140407 its reverse (70404144412), we get a palindrome (91848284819).

The spelling of 21444140407 in words is "twenty-one billion, four hundred forty-four million, one hundred forty thousand, four hundred seven".