1216211 has 4 divisors (see below), whose sum is σ = 1219800. Its totient is φ = 1212624.

The previous prime is 1216177. The next prime is 1216213. The reversal of 1216211 is 1126121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1126121 = 61 ⋅18461.

It is a cyclic number.

It is not a de Polignac number, because 1216211 - 2⁶ = 1216147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1226 + ... + 1983.

It is an arithmetic number, because the mean of its divisors is an integer number (304950).

2^1216211 is an apocalyptic number.

1216211 is a deficient number, since it is larger than the sum of its proper divisors (3589).

1216211 is an equidigital number, since it uses as much as digits as its factorization.

1216211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3588.

The product of its digits is 24, while the sum is 14.

The square root of 1216211 is about 1102.8195681978. The cubic root of 1216211 is about 106.7422391965.

The spelling of 1216211 in words is "one million, two hundred sixteen thousand, two hundred eleven".