12221016 has 32 divisors (see below), whose sum is σ = 30681600. Its totient is φ = 4056480.

The previous prime is 12220997. The next prime is 12221021. The reversal of 12221016 is 61012221.

It is a junction number, because it is equal to n+sod(n) for n = 12220986 and 12221004.

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 7 ways as a sum of consecutive naturals, for example, 5565 + ... + 7443.

It is an arithmetic number, because the mean of its divisors is an integer number (958800).

Almost surely, 2^12221016 is an apocalyptic number.

It is an amenable number.

12221016 is an abundant number, since it is smaller than the sum of its proper divisors (18460584).

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

12221016 is a wasteful number, since it uses less digits than its factorization.

12221016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2159 (or 2155 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 12221016 is about 3495.8569764794. The cubic root of 12221016 is about 230.3398630183.

Adding to 12221016 its reverse (61012221), we get a palindrome (73233237).

The spelling of 12221016 in words is "twelve million, two hundred twenty-one thousand, sixteen".