21200209922869 has 2 divisors, whose sum is σ = 21200209922870. Its totient is φ = 21200209922868.

The previous prime is 21200209922789. The next prime is 21200209922897. The reversal of 21200209922869 is 96822990200212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17293637907844 + 3906572015025 = 4158562^2 + 1976505^2 .

It is a cyclic number.

It is not a de Polignac number, because 21200209922869 - 2¹³ = 21200209914677 is a prime.

It is a super-2 number, since 2×21200209922869² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21200209929869) 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, 10600104961434 + 10600104961435.

It is an arithmetic number, because the mean of its divisors is an integer number (10600104961435).

Almost surely, 2^{21200209922869} is an apocalyptic number.

It is an amenable number.

21200209922869 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200209922869 is an equidigital number, since it uses as much as digits as its factorization.

21200209922869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 52.

The spelling of 21200209922869 in words is "twenty-one trillion, two hundred billion, two hundred nine million, nine hundred twenty-two thousand, eight hundred sixty-nine".