13634021 has 4 divisors (see below), whose sum is σ = 13641600. Its totient is φ = 13626444.

The previous prime is 13634011. The next prime is 13634063. The reversal of 13634021 is 12043631.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12043631 = 283 ⋅42557.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13634021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13633984 and 13634002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13634011) 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, 620 + ... + 5258.

It is an arithmetic number, because the mean of its divisors is an integer number (3410400).

Almost surely, 2^13634021 is an apocalyptic number.

It is an amenable number.

13634021 is a deficient number, since it is larger than the sum of its proper divisors (7579).

13634021 is an equidigital number, since it uses as much as digits as its factorization.

13634021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7578.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 13634021 is about 3692.4275212927. The cubic root of 13634021 is about 238.8955093732.

Adding to 13634021 its reverse (12043631), we get a palindrome (25677652).

The spelling of 13634021 in words is "thirteen million, six hundred thirty-four thousand, twenty-one".