21440476741679 has 2 divisors, whose sum is σ = 21440476741680. Its totient is φ = 21440476741678.

The previous prime is 21440476741667. The next prime is 21440476741693. The reversal of 21440476741679 is 97614767404412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21440476741679 - 2⁴⁴ = 3848290697263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21440476741639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10720238370839 + 10720238370840.

It is an arithmetic number, because the mean of its divisors is an integer number (10720238370840).

Almost surely, 2^{21440476741679} is an apocalyptic number.

21440476741679 is a deficient number, since it is larger than the sum of its proper divisors (1).

21440476741679 is an equidigital number, since it uses as much as digits as its factorization.

21440476741679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56899584, while the sum is 62.

The spelling of 21440476741679 in words is "twenty-one trillion, four hundred forty billion, four hundred seventy-six million, seven hundred forty-one thousand, six hundred seventy-nine".