13642521 has 4 divisors (see below), whose sum is σ = 18190032. Its totient is φ = 9095012.

The previous prime is 13642507. The next prime is 13642523. The reversal of 13642521 is 12524631.

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 a cyclic number.

It is not a de Polignac number, because 13642521 - 2⁶ = 13642457 is a prime.

It is a super-2 number, since 2×13642521² = 372236758470882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13642491 and 13642500.

It is not an unprimeable number, because it can be changed into a prime (13642523) 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, 2273751 + ... + 2273756.

It is an arithmetic number, because the mean of its divisors is an integer number (4547508).

Almost surely, 2^13642521 is an apocalyptic number.

It is an amenable number.

13642521 is a deficient number, since it is larger than the sum of its proper divisors (4547511).

13642521 is an equidigital number, since it uses as much as digits as its factorization.

13642521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4547510.

The product of its digits is 1440, while the sum is 24.

The square root of 13642521 is about 3693.5783462653. The cubic root of 13642521 is about 238.9451447666.

The spelling of 13642521 in words is "thirteen million, six hundred forty-two thousand, five hundred twenty-one".