13693021 has 4 divisors (see below), whose sum is σ = 13704444. Its totient is φ = 13681600.

The previous prime is 13692953. The next prime is 13693033. The reversal of 13693021 is 12039631.

13693021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12039631 = 61 ⋅197371.

It can be written as a sum of positive squares in 2 ways, for example, as 4901796 + 8791225 = 2214^2 + 2965^2 .

It is a cyclic number.

It is not a de Polignac number, because 13693021 - 2¹¹ = 13690973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13696021) 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, 3670 + ... + 6391.

It is an arithmetic number, because the mean of its divisors is an integer number (3426111).

Almost surely, 2^13693021 is an apocalyptic number.

It is an amenable number.

13693021 is a deficient number, since it is larger than the sum of its proper divisors (11423).

13693021 is a wasteful number, since it uses less digits than its factorization.

13693021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11422.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 13693021 is about 3700.4082207238. The cubic root of 13693021 is about 239.2396131025.

The spelling of 13693021 in words is "thirteen million, six hundred ninety-three thousand, twenty-one".