21223023099149 has 2 divisors, whose sum is σ = 21223023099150. Its totient is φ = 21223023099148.

The previous prime is 21223023099137. The next prime is 21223023099209. The reversal of 21223023099149 is 94199032032212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17907411841225 + 3315611257924 = 4231715^2 + 1820882^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21223023099149 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21223023095149) 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, 10611511549574 + 10611511549575.

It is an arithmetic number, because the mean of its divisors is an integer number (10611511549575).

Almost surely, 2^{21223023099149} is an apocalyptic number.

It is an amenable number.

21223023099149 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223023099149 is an equidigital number, since it uses as much as digits as its factorization.

21223023099149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 419904, while the sum is 47.

The spelling of 21223023099149 in words is "twenty-one trillion, two hundred twenty-three billion, twenty-three million, ninety-nine thousand, one hundred forty-nine".