13521630 has 32 divisors (see below), whose sum is σ = 34362144. Its totient is φ = 3393536.

The previous prime is 13521617. The next prime is 13521637. The reversal of 13521630 is 3612531.

It is a junction number, because it is equal to n+sod(n) for n = 13521597 and 13521606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13521637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12747 + ... + 13766.

It is an arithmetic number, because the mean of its divisors is an integer number (1073817).

Almost surely, 2^13521630 is an apocalyptic number.

13521630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13521630 is an abundant number, since it is smaller than the sum of its proper divisors (20840514).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13521630 is a wasteful number, since it uses less digits than its factorization.

13521630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26540.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 13521630 is about 3677.1769062693. The cubic root of 13521630 is about 238.2372584003.

Subtracting from 13521630 its reverse (3612531), we obtain a palindrome (9909099).

The spelling of 13521630 in words is "thirteen million, five hundred twenty-one thousand, six hundred thirty".