21834416893 has 2 divisors, whose sum is σ = 21834416894. Its totient is φ = 21834416892.

The previous prime is 21834416881. The next prime is 21834416909. The reversal of 21834416893 is 39861443812.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21786350404 + 48066489 = 147602^2 + 6933^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21834416893 is a prime.

It is a super-2 number, since 2×21834416893² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21834416393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10917208446 + 10917208447.

It is an arithmetic number, because the mean of its divisors is an integer number (10917208447).

Almost surely, 2^21834416893 is an apocalyptic number.

It is an amenable number.

21834416893 is a deficient number, since it is larger than the sum of its proper divisors (1).

21834416893 is an equidigital number, since it uses as much as digits as its factorization.

21834416893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 49.

The spelling of 21834416893 in words is "twenty-one billion, eight hundred thirty-four million, four hundred sixteen thousand, eight hundred ninety-three".