13577221 has 4 divisors (see below), whose sum is σ = 15516832. Its totient is φ = 11637612.

The previous prime is 13577209. The next prime is 13577231. The reversal of 13577221 is 12277531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 13577221 - 2⁷ = 13577093 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13577221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13577231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 969795 + ... + 969808.

It is an arithmetic number, because the mean of its divisors is an integer number (3879208).

Almost surely, 2^13577221 is an apocalyptic number.

It is an amenable number.

13577221 is a deficient number, since it is larger than the sum of its proper divisors (1939611).

13577221 is an equidigital number, since it uses as much as digits as its factorization.

13577221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1939610.

The product of its digits is 2940, while the sum is 28.

The square root of 13577221 is about 3684.7280768057. The cubic root of 13577221 is about 238.5632974730.

The spelling of 13577221 in words is "thirteen million, five hundred seventy-seven thousand, two hundred twenty-one".