21044132377 has 2 divisors, whose sum is σ = 21044132378. Its totient is φ = 21044132376.

The previous prime is 21044132341. The next prime is 21044132387. The reversal of 21044132377 is 77323144012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12229926921 + 8814205456 = 110589^2 + 93884^2 .

It is a cyclic number.

It is not a de Polignac number, because 21044132377 - 2²³ = 21035743769 is a prime.

It is not a weakly prime, because it can be changed into another prime (21044132387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10522066188 + 10522066189.

It is an arithmetic number, because the mean of its divisors is an integer number (10522066189).

Almost surely, 2^21044132377 is an apocalyptic number.

It is an amenable number.

21044132377 is a deficient number, since it is larger than the sum of its proper divisors (1).

21044132377 is an equidigital number, since it uses as much as digits as its factorization.

21044132377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 34.

Adding to 21044132377 its reverse (77323144012), we get a palindrome (98367276389).

The spelling of 21044132377 in words is "twenty-one billion, forty-four million, one hundred thirty-two thousand, three hundred seventy-seven".