13221684 has 48 divisors (see below), whose sum is σ = 39177600. Its totient is φ = 3777408.

The previous prime is 13221679. The next prime is 13221697. The reversal of 13221684 is 48612231.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7989 + ... + 9500.

It is an arithmetic number, because the mean of its divisors is an integer number (816200).

Almost surely, 2^13221684 is an apocalyptic number.

13221684 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

13221684 is an abundant number, since it is smaller than the sum of its proper divisors (25955916).

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

13221684 is a wasteful number, since it uses less digits than its factorization.

13221684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17509 (or 17501 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 13221684 is about 3636.1633626668. The cubic root of 13221684 is about 236.4624895999.

The spelling of 13221684 in words is "thirteen million, two hundred twenty-one thousand, six hundred eighty-four".