13767221 has 4 divisors (see below), whose sum is σ = 14826252. Its totient is φ = 12708192.

The previous prime is 13767217. The next prime is 13767223. The reversal of 13767221 is 12276731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12276731 = 1051 ⋅11681.

It can be written as a sum of positive squares in 2 ways, for example, as 3276100 + 10491121 = 1810^2 + 3239^2 .

It is a cyclic number.

It is not a de Polignac number, because 13767221 - 2² = 13767217 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 (13767223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 529496 + ... + 529521.

It is an arithmetic number, because the mean of its divisors is an integer number (3706563).

Almost surely, 2^13767221 is an apocalyptic number.

It is an amenable number.

13767221 is a deficient number, since it is larger than the sum of its proper divisors (1059031).

13767221 is a wasteful number, since it uses less digits than its factorization.

13767221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059030.

The product of its digits is 3528, while the sum is 29.

The square root of 13767221 is about 3710.4205961050. The cubic root of 13767221 is about 239.6709669354.

The spelling of 13767221 in words is "thirteen million, seven hundred sixty-seven thousand, two hundred twenty-one".