13220999 has 4 divisors (see below), whose sum is σ = 14422920. Its totient is φ = 12019080.

The previous prime is 13220993. The next prime is 13221007. The reversal of 13220999 is 99902231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13220999 - 2²⁰ = 12172423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 600944 + ... + 600965.

It is an arithmetic number, because the mean of its divisors is an integer number (3605730).

Almost surely, 2^13220999 is an apocalyptic number.

13220999 is a deficient number, since it is larger than the sum of its proper divisors (1201921).

13220999 is a wasteful number, since it uses less digits than its factorization.

13220999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1201920.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 13220999 is about 3636.0691687590. The cubic root of 13220999 is about 236.4584059142.

The spelling of 13220999 in words is "thirteen million, two hundred twenty thousand, nine hundred ninety-nine".