21440476741639 has 2 divisors, whose sum is σ = 21440476741640. Its totient is φ = 21440476741638.

The previous prime is 21440476741603. The next prime is 21440476741667. The reversal of 21440476741639 is 93614767404412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21440476741639 - 2⁹ = 21440476741127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21440476741679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10720238370819 + 10720238370820.

It is an arithmetic number, because the mean of its divisors is an integer number (10720238370820).

Almost surely, 2^{21440476741639} is an apocalyptic number.

21440476741639 is a deficient number, since it is larger than the sum of its proper divisors (1).

21440476741639 is an equidigital number, since it uses as much as digits as its factorization.

21440476741639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24385536, while the sum is 58.

The spelling of 21440476741639 in words is "twenty-one trillion, four hundred forty billion, four hundred seventy-six million, seven hundred forty-one thousand, six hundred thirty-nine".