2157216267 has 8 divisors (see below), whose sum is σ = 2894609296. Its totient is φ = 1428983712.

The previous prime is 2157216263. The next prime is 2157216289. The reversal of 2157216267 is 7626127512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2157216267 - 2² = 2157216263 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2157216263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2289568 + ... + 2290509.

It is an arithmetic number, because the mean of its divisors is an integer number (361826162).

Almost surely, 2^2157216267 is an apocalyptic number.

2157216267 is a deficient number, since it is larger than the sum of its proper divisors (737393029).

2157216267 is a wasteful number, since it uses less digits than its factorization.

2157216267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4580237.

The product of its digits is 70560, while the sum is 39.

The square root of 2157216267 is about 46445.8423004686. The cubic root of 2157216267 is about 1292.1052631682.

The spelling of 2157216267 in words is "two billion, one hundred fifty-seven million, two hundred sixteen thousand, two hundred sixty-seven".