2157215 has 16 divisors (see below), whose sum is σ = 2812320. Its totient is φ = 1582080.

The previous prime is 2157209. The next prime is 2157229. The reversal of 2157215 is 5127512.

It is a happy number.

It is not a de Polignac number, because 2157215 - 2⁶ = 2157151 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3176 + ... + 3794.

It is an arithmetic number, because the mean of its divisors is an integer number (175770).

2^2157215 is an apocalyptic number.

2157215 is a deficient number, since it is larger than the sum of its proper divisors (655105).

2157215 is a wasteful number, since it uses less digits than its factorization.

2157215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682.

The product of its digits is 700, while the sum is 23.

The square root of 2157215 is about 1468.7460638245. The cubic root of 2157215 is about 129.2105010204.

The spelling of 2157215 in words is "two million, one hundred fifty-seven thousand, two hundred fifteen".