13486221 has 36 divisors (see below), whose sum is σ = 23128092. Its totient is φ = 7547904.

The previous prime is 13486217. The next prime is 13486223. The reversal of 13486221 is 12268431.

13486221 is a `hidden beast` number, since 1 + 34 + 8 + 622 + 1 = 666.

13486221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

13486221 is a nontrivial binomial coefficient, being equal to C(5194, 2).

It can be written as a sum of positive squares in 2 ways, for example, as 12152196 + 1334025 = 3486^2 + 1155^2 .

It is not a de Polignac number, because 13486221 - 2² = 13486217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13486223) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 23085 + ... + 23661.

It is an arithmetic number, because the mean of its divisors is an integer number (642447).

Almost surely, 2^13486221 is an apocalyptic number.

13486221 is the 5193-rd triangular number and also the 2597-th hexagonal number.

It is an amenable number.

13486221 is a deficient number, since it is larger than the sum of its proper divisors (9641871).

13486221 is a wasteful number, since it uses less digits than its factorization.

13486221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650 (or 640 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 13486221 is about 3672.3590510733. The cubic root of 13486221 is about 238.0291198510.

It can be divided in two parts, 1348 and 6221, that added together give a square (7569 = 87²).

The spelling of 13486221 in words is "thirteen million, four hundred eighty-six thousand, two hundred twenty-one".