21431044013377 has 2 divisors, whose sum is σ = 21431044013378. Its totient is φ = 21431044013376.

The previous prime is 21431044013339. The next prime is 21431044013413. The reversal of 21431044013377 is 77331044013412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21430594403761 + 449609616 = 4629319^2 + 21204^2 .

It is a cyclic number.

It is not a de Polignac number, because 21431044013377 - 2¹⁵ = 21431043980609 is a prime.

It is not a weakly prime, because it can be changed into another prime (21431044023377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10715522006688 + 10715522006689.

It is an arithmetic number, because the mean of its divisors is an integer number (10715522006689).

Almost surely, 2^{21431044013377} is an apocalyptic number.

It is an amenable number.

21431044013377 is a deficient number, since it is larger than the sum of its proper divisors (1).

21431044013377 is an equidigital number, since it uses as much as digits as its factorization.

21431044013377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 40.

Adding to 21431044013377 its reverse (77331044013412), we get a palindrome (98762088026789).

The spelling of 21431044013377 in words is "twenty-one trillion, four hundred thirty-one billion, forty-four million, thirteen thousand, three hundred seventy-seven".