20011209881149 has 2 divisors, whose sum is σ = 20011209881150. Its totient is φ = 20011209881148.

The previous prime is 20011209881093. The next prime is 20011209881191. The reversal of 20011209881149 is 94118890211002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15659772161049 + 4351437720100 = 3957243^2 + 2086010^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011209881149 - 2⁹ = 20011209880637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20011209881099 and 20011209881108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20011209881449) 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, 10005604940574 + 10005604940575.

It is an arithmetic number, because the mean of its divisors is an integer number (10005604940575).

Almost surely, 2^{20011209881149} is an apocalyptic number.

It is an amenable number.

20011209881149 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011209881149 is an equidigital number, since it uses as much as digits as its factorization.

20011209881149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 46.

The spelling of 20011209881149 in words is "twenty trillion, eleven billion, two hundred nine million, eight hundred eighty-one thousand, one hundred forty-nine".