2172908681147 has 2 divisors, whose sum is σ = 2172908681148. Its totient is φ = 2172908681146.

The previous prime is 2172908681137. The next prime is 2172908681149. The reversal of 2172908681147 is 7411868092712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2172908681147 - 2¹⁶ = 2172908615611 is a prime.

Together with 2172908681149, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2172908681092 and 2172908681101.

It is not a weakly prime, because it can be changed into another prime (2172908681149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086454340573 + 1086454340574.

It is an arithmetic number, because the mean of its divisors is an integer number (1086454340574).

Almost surely, 2^{2172908681147} is an apocalyptic number.

2172908681147 is a deficient number, since it is larger than the sum of its proper divisors (1).

2172908681147 is an equidigital number, since it uses as much as digits as its factorization.

2172908681147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2709504, while the sum is 56.

The spelling of 2172908681147 in words is "two trillion, one hundred seventy-two billion, nine hundred eight million, six hundred eighty-one thousand, one hundred forty-seven".