13520221 has 8 divisors (see below), whose sum is σ = 15884064. Its totient is φ = 11345520.

The previous prime is 13520203. The next prime is 13520231. The reversal of 13520221 is 12202531.

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

It is a cyclic number.

It is not a de Polignac number, because 13520221 - 2¹¹ = 13518173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13520195 and 13520204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13520231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47131 + ... + 47416.

It is an arithmetic number, because the mean of its divisors is an integer number (1985508).

Almost surely, 2^13520221 is an apocalyptic number.

13520221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13520221 is a deficient number, since it is larger than the sum of its proper divisors (2363843).

13520221 is a wasteful number, since it uses less digits than its factorization.

13520221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94571.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 13520221 is about 3676.9853140854. The cubic root of 13520221 is about 238.2289830677.

Adding to 13520221 its reverse (12202531), we get a palindrome (25722752).

The spelling of 13520221 in words is "thirteen million, five hundred twenty thousand, two hundred twenty-one".