2161215 has 32 divisors (see below), whose sum is σ = 4392960. Its totient is φ = 987552.

The previous prime is 2161213. The next prime is 2161253. The reversal of 2161215 is 5121612.

It is not a de Polignac number, because 2161215 - 2¹ = 2161213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161213) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 199 + ... + 2088.

It is an arithmetic number, because the mean of its divisors is an integer number (137280).

2^2161215 is an apocalyptic number.

2161215 is an abundant number, since it is smaller than the sum of its proper divisors (2231745).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2161215 is a wasteful number, since it uses less digits than its factorization.

2161215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2308 (or 2302 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 2161215 is about 1470.1071389528. The cubic root of 2161215 is about 129.2903142491.

Adding to 2161215 its reverse (5121612), we get a palindrome (7282827).

It can be divided in two parts, 216 and 1215, that added together give a triangular number (1431 = T₅₃).

The spelling of 2161215 in words is "two million, one hundred sixty-one thousand, two hundred fifteen".