13630021 has 4 divisors (see below), whose sum is σ = 13737472. Its totient is φ = 13522572.

The previous prime is 13630009. The next prime is 13630031. The reversal of 13630021 is 12003631.

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: 12003631 = 23 ⋅521897.

It is a cyclic number.

It is not a de Polignac number, because 13630021 - 2⁵ = 13629989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13629977 and 13630004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13630031) 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, 53535 + ... + 53788.

It is an arithmetic number, because the mean of its divisors is an integer number (3434368).

Almost surely, 2^13630021 is an apocalyptic number.

It is an amenable number.

13630021 is a deficient number, since it is larger than the sum of its proper divisors (107451).

13630021 is a wasteful number, since it uses less digits than its factorization.

13630021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107450.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 13630021 is about 3691.8858324710. The cubic root of 13630021 is about 238.8721444025.

Adding to 13630021 its reverse (12003631), we get a palindrome (25633652).

The spelling of 13630021 in words is "thirteen million, six hundred thirty thousand, twenty-one".