21838693417 has 2 divisors, whose sum is σ = 21838693418. Its totient is φ = 21838693416.

The previous prime is 21838693381. The next prime is 21838693421. The reversal of 21838693417 is 71439683812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17097131536 + 4741561881 = 130756^2 + 68859^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21838693417 is a prime.

It is not a weakly prime, because it can be changed into another prime (21838693427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10919346708 + 10919346709.

It is an arithmetic number, because the mean of its divisors is an integer number (10919346709).

Almost surely, 2^21838693417 is an apocalyptic number.

It is an amenable number.

21838693417 is a deficient number, since it is larger than the sum of its proper divisors (1).

21838693417 is an equidigital number, since it uses as much as digits as its factorization.

21838693417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 52.

The spelling of 21838693417 in words is "twenty-one billion, eight hundred thirty-eight million, six hundred ninety-three thousand, four hundred seventeen".