1211215 has 4 divisors (see below), whose sum is σ = 1453464. Its totient is φ = 968968.

The previous prime is 1211207. The next prime is 1211227. The reversal of 1211215 is 5121121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5121121 = 601 ⋅8521.

It is a cyclic number.

It is not a de Polignac number, because 1211215 - 2³ = 1211207 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211195 and 1211204.

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 3 ways as a sum of consecutive naturals, for example, 121117 + ... + 121126.

It is an arithmetic number, because the mean of its divisors is an integer number (363366).

2^1211215 is an apocalyptic number.

1211215 is a deficient number, since it is larger than the sum of its proper divisors (242249).

1211215 is an equidigital number, since it uses as much as digits as its factorization.

1211215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242248.

The product of its digits is 20, while the sum is 13.

The square root of 1211215 is about 1100.5521341581. The cubic root of 1211215 is about 106.5958785970.

Adding to 1211215 its reverse (5121121), we get a palindrome (6332336).

The spelling of 1211215 in words is "one million, two hundred eleven thousand, two hundred fifteen".