10421216 has 72 divisors (see below), whose sum is σ = 23242464. Its totient is φ = 4592640.

The previous prime is 10421207. The next prime is 10421233. The reversal of 10421216 is 61212401.

It is a junction number, because it is equal to n+sod(n) for n = 10421194 and 10421203.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 221705 + ... + 221751.

It is an arithmetic number, because the mean of its divisors is an integer number (322812).

Almost surely, 2^10421216 is an apocalyptic number.

10421216 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 10421216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11621232).

10421216 is an abundant number, since it is smaller than the sum of its proper divisors (12821248).

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

10421216 is a wasteful number, since it uses less digits than its factorization.

10421216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124 (or 103 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 10421216 is about 3228.1908245951. The cubic root of 10421216 is about 218.4269052265.

Adding to 10421216 its reverse (61212401), we get a palindrome (71633617).

The spelling of 10421216 in words is "ten million, four hundred twenty-one thousand, two hundred sixteen".