13401521 has 4 divisors (see below), whose sum is σ = 15316032. Its totient is φ = 11487012.

The previous prime is 13401503. The next prime is 13401523. The reversal of 13401521 is 12510431.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12510431 = 2011 ⋅6221.

It is a cyclic number.

It is not a de Polignac number, because 13401521 - 2¹⁸ = 13139377 is a prime.

It is a super-2 number, since 2×13401521² = 359201530226882, which contains 22 as substring.

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 13401521.

It is not an unprimeable number, because it can be changed into a prime (13401523) 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, 957245 + ... + 957258.

It is an arithmetic number, because the mean of its divisors is an integer number (3829008).

Almost surely, 2^13401521 is an apocalyptic number.

It is an amenable number.

13401521 is a deficient number, since it is larger than the sum of its proper divisors (1914511).

13401521 is an equidigital number, since it uses as much as digits as its factorization.

13401521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1914510.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 13401521 is about 3660.8087904178. The cubic root of 13401521 is about 237.5297602596.

Adding to 13401521 its reverse (12510431), we get a palindrome (25911952).

The spelling of 13401521 in words is "thirteen million, four hundred one thousand, five hundred twenty-one".