13221880 has 32 divisors (see below), whose sum is σ = 33999840.
Its totient is φ = 4533120.
The previous prime is 13221877. The next prime is 13221881. The reversal of 13221880 is 8812231.
It is a super-2 number, since 2×132218802 = 349636221468800, which contains 22 as substring.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (13221881) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23331 + ... + 23890.
It is an arithmetic number, because the mean of its divisors is an integer number (1062495).
Almost surely, 213221880 is an apocalyptic number.
13221880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
13221880 is an abundant number, since it is smaller than the sum of its proper divisors (20777960).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
13221880 is a wasteful number, since it uses less digits than its factorization.
13221880 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 47239 (or 47235 counting only the distinct ones).
The product of its (nonzero) digits is 768, while the sum is 25.
The square root of 13221880 is about 3636.1903140512.
The cubic root of 13221880 is about 236.4636580445.
The spelling of 13221880 in words is "thirteen million, two hundred twenty-one thousand, eight hundred eighty".