21794748889 has 2 divisors, whose sum is σ = 21794748890. Its totient is φ = 21794748888.

The previous prime is 21794748823. The next prime is 21794748923. The reversal of 21794748889 is 98884749712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14176950489 + 7617798400 = 119067^2 + 87280^2 .

It is a cyclic number.

It is not a de Polignac number, because 21794748889 - 2¹⁵ = 21794716121 is a prime.

It is a super-2 number, since 2×21794748889² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21794448889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10897374444 + 10897374445.

It is an arithmetic number, because the mean of its divisors is an integer number (10897374445).

Almost surely, 2^21794748889 is an apocalyptic number.

It is an amenable number.

21794748889 is a deficient number, since it is larger than the sum of its proper divisors (1).

21794748889 is an equidigital number, since it uses as much as digits as its factorization.

21794748889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 65028096, while the sum is 67.

The spelling of 21794748889 in words is "twenty-one billion, seven hundred ninety-four million, seven hundred forty-eight thousand, eight hundred eighty-nine".