13221790 has 8 divisors (see below), whose sum is σ = 23799240. Its totient is φ = 5288712.

The previous prime is 13221781. The next prime is 13221821. The reversal of 13221790 is 9712231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 661080 + ... + 661099.

It is an arithmetic number, because the mean of its divisors is an integer number (2974905).

Almost surely, 2^13221790 is an apocalyptic number.

13221790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13221790 is a deficient number, since it is larger than the sum of its proper divisors (10577450).

13221790 is a wasteful number, since it uses less digits than its factorization.

13221790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322186.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 13221790 is about 3636.1779384403. The cubic root of 13221790 is about 236.4631215153.

The spelling of 13221790 in words is "thirteen million, two hundred twenty-one thousand, seven hundred ninety".