13221716 has 24 divisors (see below), whose sum is σ = 24708096. Its totient is φ = 6168960.

The previous prime is 13221697. The next prime is 13221737. The reversal of 13221716 is 61712231.

It is a junction number, because it is equal to n+sod(n) for n = 13221691 and 13221700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7871 + ... + 9401.

It is an arithmetic number, because the mean of its divisors is an integer number (1029504).

Almost surely, 2^13221716 is an apocalyptic number.

It is an amenable number.

13221716 is a deficient number, since it is larger than the sum of its proper divisors (11486380).

13221716 is a wasteful number, since it uses less digits than its factorization.

13221716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679 (or 1677 counting only the distinct ones).

The product of its digits is 504, while the sum is 23.

The square root of 13221716 is about 3636.1677629064. The cubic root of 13221716 is about 236.4626803671.

Adding to 13221716 its reverse (61712231), we get a palindrome (74933947).

The spelling of 13221716 in words is "thirteen million, two hundred twenty-one thousand, seven hundred sixteen".