2172155107 has 4 divisors (see below), whose sum is σ = 2286479080. Its totient is φ = 2057831136.

The previous prime is 2172155101. The next prime is 2172155119. The reversal of 2172155107 is 7015512712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2172155107 - 2⁷ = 2172154979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2172155101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57161958 + ... + 57161995.

It is an arithmetic number, because the mean of its divisors is an integer number (571619770).

Almost surely, 2^2172155107 is an apocalyptic number.

2172155107 is a deficient number, since it is larger than the sum of its proper divisors (114323973).

2172155107 is a wasteful number, since it uses less digits than its factorization.

2172155107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114323972.

The product of its (nonzero) digits is 4900, while the sum is 31.

The square root of 2172155107 is about 46606.3848308362. The cubic root of 2172155107 is about 1295.0810376483.

Adding to 2172155107 its reverse (7015512712), we get a palindrome (9187667819).

The spelling of 2172155107 in words is "two billion, one hundred seventy-two million, one hundred fifty-five thousand, one hundred seven".