10001216 has 14 divisors (see below), whose sum is σ = 19846290. Its totient is φ = 5000576.

The previous prime is 10001213. The next prime is 10001221. The reversal of 10001216 is 61210001.

It can be written as a sum of positive squares in only one way, i.e., 7311616 + 2689600 = 2704^2 + 1640^2 .

It is a junction number, because it is equal to n+sod(n) for n = 10001197 and 10001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78071 + ... + 78198.

Almost surely, 2^10001216 is an apocalyptic number.

10001216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

10001216 is a deficient number, since it is larger than the sum of its proper divisors (9845074).

10001216 is an equidigital number, since it uses as much as digits as its factorization.

10001216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156281 (or 156271 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 10001216 is about 3162.4699208056. The cubic root of 10001216 is about 215.4522012912.

Adding to 10001216 its reverse (61210001), we get a palindrome (71211217).

The spelling of 10001216 in words is "ten million, one thousand, two hundred sixteen".