21044101138297 has 2 divisors, whose sum is σ = 21044101138298. Its totient is φ = 21044101138296.

The previous prime is 21044101138211. The next prime is 21044101138309. The reversal of 21044101138297 is 79283110144012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21044091963456 + 9174841 = 4587384^2 + 3029^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21044101138297 is a prime.

It is a super-2 number, since 2×21044101138297² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21044101138397) 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, 10522050569148 + 10522050569149.

It is an arithmetic number, because the mean of its divisors is an integer number (10522050569149).

Almost surely, 2^{21044101138297} is an apocalyptic number.

It is an amenable number.

21044101138297 is a deficient number, since it is larger than the sum of its proper divisors (1).

21044101138297 is an equidigital number, since it uses as much as digits as its factorization.

21044101138297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 43.

The spelling of 21044101138297 in words is "twenty-one trillion, forty-four billion, one hundred one million, one hundred thirty-eight thousand, two hundred ninety-seven".