2154215 has 16 divisors (see below), whose sum is σ = 3005760. Its totient is φ = 1451520.

The previous prime is 2154209. The next prime is 2154227. The reversal of 2154215 is 5124512.

It is not a de Polignac number, because 2154215 - 2⁸ = 2153959 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1631 + ... + 2639.

It is an arithmetic number, because the mean of its divisors is an integer number (187860).

2^2154215 is an apocalyptic number.

2154215 is a deficient number, since it is larger than the sum of its proper divisors (851545).

2154215 is a wasteful number, since it uses less digits than its factorization.

2154215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1082.

The product of its digits is 400, while the sum is 20.

The square root of 2154215 is about 1467.7244291760. The cubic root of 2154215 is about 129.1505763285.

Adding to 2154215 its reverse (5124512), we get a palindrome (7278727).

The spelling of 2154215 in words is "two million, one hundred fifty-four thousand, two hundred fifteen".