2172118251247 has 6 divisors (see below), whose sum is σ = 2526749802528. Its totient is φ = 1861815643884.

The previous prime is 2172118251211. The next prime is 2172118251257. The reversal of 2172118251247 is 7421528112712.

It is a de Polignac number, because none of the positive numbers 2^k-2172118251247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172118251257) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22164471903 + ... + 22164472000.

It is an arithmetic number, because the mean of its divisors is an integer number (421124967088).

Almost surely, 2^{2172118251247} is an apocalyptic number.

2172118251247 is a deficient number, since it is larger than the sum of its proper divisors (354631551281).

2172118251247 is an equidigital number, since it uses as much as digits as its factorization.

2172118251247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44328943917 (or 44328943910 counting only the distinct ones).

The product of its digits is 125440, while the sum is 43.

The spelling of 2172118251247 in words is "two trillion, one hundred seventy-two billion, one hundred eighteen million, two hundred fifty-one thousand, two hundred forty-seven".