2121215 has 4 divisors (see below), whose sum is σ = 2545464. Its totient is φ = 1696968.

The previous prime is 2121199. The next prime is 2121239. The reversal of 2121215 is 5121212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2121215 - 2⁴ = 2121199 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212117 + ... + 212126.

It is an arithmetic number, because the mean of its divisors is an integer number (636366).

2^2121215 is an apocalyptic number.

2121215 is a deficient number, since it is larger than the sum of its proper divisors (424249).

2121215 is an equidigital number, since it uses as much as digits as its factorization.

2121215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424248.

The product of its digits is 40, while the sum is 14.

The square root of 2121215 is about 1456.4391508058. The cubic root of 2121215 is about 128.4877023968.

Adding to 2121215 its reverse (5121212), we get a palindrome (7242427).

The spelling of 2121215 in words is "two million, one hundred twenty-one thousand, two hundred fifteen".