2157214171 has 6 divisors (see below), whose sum is σ = 2509412460. Its totient is φ = 1849040676.

The previous prime is 2157214159. The next prime is 2157214177. The reversal of 2157214171 is 1714127512.

It is not a de Polignac number, because 2157214171 - 2¹³ = 2157205979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2157214177) 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, 22012341 + ... + 22012438.

It is an arithmetic number, because the mean of its divisors is an integer number (418235410).

Almost surely, 2^2157214171 is an apocalyptic number.

2157214171 is a deficient number, since it is larger than the sum of its proper divisors (352198289).

2157214171 is an equidigital number, since it uses as much as digits as its factorization.

2157214171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44024793 (or 44024786 counting only the distinct ones).

The product of its digits is 3920, while the sum is 31.

The square root of 2157214171 is about 46445.8197365490. The cubic root of 2157214171 is about 1292.1048446885.

The spelling of 2157214171 in words is "two billion, one hundred fifty-seven million, two hundred fourteen thousand, one hundred seventy-one".