21183949099 has 2 divisors, whose sum is σ = 21183949100. Its totient is φ = 21183949098.

The previous prime is 21183949057. The next prime is 21183949103. The reversal of 21183949099 is 99094938112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21183949099 - 2¹⁹ = 21183424811 is a prime.

It is not a weakly prime, because it can be changed into another prime (21183929099) 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, 10591974549 + 10591974550.

It is an arithmetic number, because the mean of its divisors is an integer number (10591974550).

Almost surely, 2^21183949099 is an apocalyptic number.

21183949099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21183949099 is an equidigital number, since it uses as much as digits as its factorization.

21183949099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1259712, while the sum is 55.

The spelling of 21183949099 in words is "twenty-one billion, one hundred eighty-three million, nine hundred forty-nine thousand, ninety-nine".