21201945093317 has 2 divisors, whose sum is σ = 21201945093318. Its totient is φ = 21201945093316.

The previous prime is 21201945093233. The next prime is 21201945093337. The reversal of 21201945093317 is 71339054910212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19378713319876 + 1823231773441 = 4402126^2 + 1350271^2 .

It is a cyclic number.

It is not a de Polignac number, because 21201945093317 - 2⁸ = 21201945093061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21201945093337) 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, 10600972546658 + 10600972546659.

It is an arithmetic number, because the mean of its divisors is an integer number (10600972546659).

Almost surely, 2^{21201945093317} is an apocalyptic number.

It is an amenable number.

21201945093317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201945093317 is an equidigital number, since it uses as much as digits as its factorization.

21201945093317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 47.

The spelling of 21201945093317 in words is "twenty-one trillion, two hundred one billion, nine hundred forty-five million, ninety-three thousand, three hundred seventeen".