20109192729251 has 2 divisors, whose sum is σ = 20109192729252. Its totient is φ = 20109192729250.

The previous prime is 20109192729247. The next prime is 20109192729271. The reversal of 20109192729251 is 15292729190102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20109192729251 - 2² = 20109192729247 is a prime.

It is a super-2 number, since 2×20109192729251² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20109192729251.

It is not a weakly prime, because it can be changed into another prime (20109192729271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10054596364625 + 10054596364626.

It is an arithmetic number, because the mean of its divisors is an integer number (10054596364626).

Almost surely, 2^{20109192729251} is an apocalyptic number.

20109192729251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20109192729251 is an equidigital number, since it uses as much as digits as its factorization.

20109192729251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 408240, while the sum is 50.

The spelling of 20109192729251 in words is "twenty trillion, one hundred nine billion, one hundred ninety-two million, seven hundred twenty-nine thousand, two hundred fifty-one".