20109192729291 has 24 divisors (see below), whose sum is σ = 29664914273280. Its totient is φ = 13120763645616.

The previous prime is 20109192729287. The next prime is 20109192729331. The reversal of 20109192729291 is 19292729190102.

It is a happy number.

It is not a de Polignac number, because 20109192729291 - 2² = 20109192729287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20109192729251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64446190 + ... + 64757468.

It is an arithmetic number, because the mean of its divisors is an integer number (1236038094720).

Almost surely, 2^{20109192729291} is an apocalyptic number.

20109192729291 is a deficient number, since it is larger than the sum of its proper divisors (9555721543989).

20109192729291 is a wasteful number, since it uses less digits than its factorization.

20109192729291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464055 (or 464052 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 54.

The spelling of 20109192729291 in words is "twenty trillion, one hundred nine billion, one hundred ninety-two million, seven hundred twenty-nine thousand, two hundred ninety-one".