21099444019 has 2 divisors, whose sum is σ = 21099444020. Its totient is φ = 21099444018.

The previous prime is 21099444011. The next prime is 21099444089. The reversal of 21099444019 is 91044499012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21099444019 - 2³ = 21099444011 is a prime.

It is a super-2 number, since 2×21099444019² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21099444011) 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, 10549722009 + 10549722010.

It is an arithmetic number, because the mean of its divisors is an integer number (10549722010).

Almost surely, 2^21099444019 is an apocalyptic number.

21099444019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21099444019 is an equidigital number, since it uses as much as digits as its factorization.

21099444019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 43.

The spelling of 21099444019 in words is "twenty-one billion, ninety-nine million, four hundred forty-four thousand, nineteen".