21141293917 has 2 divisors, whose sum is σ = 21141293918. Its totient is φ = 21141293916.

The previous prime is 21141293897. The next prime is 21141293923. The reversal of 21141293917 is 71939214112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19822950436 + 1318343481 = 140794^2 + 36309^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21141293917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21141293917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21141293947) 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, 10570646958 + 10570646959.

It is an arithmetic number, because the mean of its divisors is an integer number (10570646959).

Almost surely, 2^21141293917 is an apocalyptic number.

It is an amenable number.

21141293917 is a deficient number, since it is larger than the sum of its proper divisors (1).

21141293917 is an equidigital number, since it uses as much as digits as its factorization.

21141293917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 40.

The spelling of 21141293917 in words is "twenty-one billion, one hundred forty-one million, two hundred ninety-three thousand, nine hundred seventeen".