1211216 has 40 divisors (see below), whose sum is σ = 2560104. Its totient is φ = 552960.

The previous prime is 1211207. The next prime is 1211227. The reversal of 1211216 is 6121121.

1211216 = T₁₆₈ + T₁₆₉ + ... + T₂₂₈.

It can be written as a sum of positive squares in 4 ways, for example, as 87616 + 1123600 = 296^2 + 1060^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1211216.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16556 + ... + 16628.

2^1211216 is an apocalyptic number.

1211216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1280052).

1211216 is an abundant number, since it is smaller than the sum of its proper divisors (1348888).

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

1211216 is a wasteful number, since it uses less digits than its factorization.

1211216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 153 counting only the distinct ones).

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

The square root of 1211216 is about 1100.5525884754. The cubic root of 1211216 is about 106.5959079328.

Adding to 1211216 its reverse (6121121), we get a palindrome (7332337).

The spelling of 1211216 in words is "one million, two hundred eleven thousand, two hundred sixteen".