15221316 has 48 divisors (see below), whose sum is σ = 39106368. Its totient is φ = 4607680.

The previous prime is 15221293. The next prime is 15221321. The reversal of 15221316 is 61312251.

It is a junction number, because it is equal to n+sod(n) for n = 15221292 and 15221301.

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, 15496 + ... + 16448.

It is an arithmetic number, because the mean of its divisors is an integer number (814716).

Almost surely, 2^15221316 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15221316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19553184).

15221316 is an abundant number, since it is smaller than the sum of its proper divisors (23885052).

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

15221316 is a wasteful number, since it uses less digits than its factorization.

15221316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993 (or 969 counting only the distinct ones).

The product of its digits is 360, while the sum is 21.

The square root of 15221316 is about 3901.4504994937. The cubic root of 15221316 is about 247.8282065525.

Adding to 15221316 its reverse (61312251), we get a palindrome (76533567).

The spelling of 15221316 in words is "fifteen million, two hundred twenty-one thousand, three hundred sixteen".